Podcasts about manual j

“We're not guessing what's inside the walls—we're measuring how homes really use energy.” Max Reichlin In this episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn sit down with Max Reichlin from Clean Power Research to explore a groundbreaking HVAC tool: Thermentor. Designed to bridge the gap between estimated and actual residential energy loads, Thermentor leverages real energy usage data to perform virtual energy audits. The goal? More accurate, faster, and accessible load calculations that empower contractors and homeowners alike—particularly when considering heat pumps, dual fuel systems, or just right-sizing equipment. Max shares the origin story of Thermentor, explains how the tool works, and discusses its current deployment across a handful of U.S. states, with more to come. He also outlines future plans, including better integration with real-time thermostat data and improved incentive visibility. Listeners will gain insight into how traditional Manual J calculations may overshoot actual needs, and why tools like Thermentor could reshape how we approach home comfort and efficiency. Whether you're an HVAC pro or a curious homeowner, this episode delivers valuable context on where HVAC technology is headed—and how data-driven tools are making that future a little smarter.   Max's LinkedIn: https://www.linkedin.com/in/maxreichlin/ Thermentor website: https://www.thermentor.com/ Thermentor White Papers: https://www.thermentor.com/how-does-it-work/#white-papers     This episode was recorded in May 2025.  

Welcome to the first official “Ask The Experts” edition of Build. Matt answers real questions from builders, architects, and fans of the show. This episode covers a wide range of high-performance building topics that every pro should consider. First, Matt breaks down unvented attic assemblies in LA's dry climate, offering insulation recommendations and best practices for staying code-compliant without overcomplicating the build. Then, he dives into the hot topic of venting dryers in airtight homes—exploring options like heat pump dryers and makeup air systems.Next up, a thoughtful discussion on HVAC design in energy-efficient, all-electric homes, especially when working with contractors who size systems by square footage instead of proper Manual J calculations. Matt shares practical advice for builders working in high desert climates and explains the value of multi-stage and VRF equipment. Finally, he addresses one of the most overlooked but crucial areas of waterproofing: sill pans. From stainless steel to PVC, Matt discusses materials, back dam design, and how to prevent rust or water intrusion under doors.Have a question for Matt (or any of the Build Experts)? Send an email to asktheexperts@buildproductions.com and it might get featured on the next show!Thank you to episode sponsors Mbrico & Pella. Learn more at mbricotiledecks.com & pella.com. Save the Date for Build Show LIVE 2025 in Dallas, TX: October 16-18, 2025!Don't miss a single episode of Build Show content. Sign up for our newsletter.

The crew bats about ideas on insulating attic living space and offer opinions on fastening extension jambs. Kieth has a good suggestion for getting into the construction business and doing good work.   Tune in to Episode 668 of the Fine Homebuilding Podcast to learn more about:  ·       Getting a good trade job   ·       Insulation in attic living spaces  ·       The best ways to fasten custom extension jambs   Have a question or topic you want us to talk about on the show? Email us at fhbpodcast@taunton.com.     ➡️➡️ Check Out the Full Show Notes: FHB Podcast 668 ➡️ Learn about SketchUp for Builders by Jon Beer, the new E-learning course from Fine Homebuilding  ➡️ Follow Fine Homebuilding on Social Media:   Instagram • Facebook • TikTok • Pinterest • YouTube  ⭐⭐⭐⭐⭐  If you enjoy the show, please subscribe and rate us on iTunes, Spotify, YouTube Music, or wherever you prefer to listen. 

In this conversation, Reuben Saltzman and Tessa Murry discuss the importance of proper HVAC sizing and the upcoming refrigerant changes that will affect the industry. They are joined by Robin Johnson from High Road Heating and Air, who shares insights on the significance of manual J calculations for HVAC systems, the transition to new refrigerants due to environmental concerns, and the challenges of older HVAC systems. The discussion also touches on advancements in HVAC efficiency and the future of heating and cooling technology. In this conversation, Robin Johnson discusses the evolving landscape of home heating systems, focusing on the transition from traditional gas furnaces to high-efficiency options and heat pumps. She highlights the importance of understanding upcoming regulations, the rising costs of new systems, and the necessity of regular maintenance to ensure longevity. Additionally, Robin emphasizes the growing role of women in the HVAC industry and the need for more female representation in technical roles.TakeawaysProper HVAC sizing is crucial for efficiency and comfort.Manual J calculations ensure the right equipment size for homes.Upcoming refrigerant changes aim to reduce environmental impact.New refrigerants will be less forgiving and more costly to repair.The HVAC industry is moving towards higher efficiency standards.Older systems may face challenges in finding replacement parts.The transition to new refrigerants will happen gradually.Homeowners should be aware of the implications of refrigerant changes.Advancements in technology are leading to shorter lifespans for appliances.Legislation may affect rebates for high-efficiency HVAC systems. Electric heating requires backup sources for efficiency.High-efficiency furnaces are becoming mandatory.Future mandates may eliminate low-efficiency options.Heat pumps are gaining popularity for home heating.Costs for new heating systems are significantly increasing.Regular maintenance is crucial for system longevity.Investing in efficient systems can save money long-term.Women are increasingly entering the HVAC industry.The HVAC industry is constantly evolving with new technologies.Educating homeowners on costs and options is essential.Chapters00:00 Introduction and Guest Introduction03:11 The Importance of Proper HVAC Sizing05:59 Upcoming Changes in HVAC Refrigerants09:10 Understanding Refrigerant Changes and Their Impact12:00 Future of Refrigerants and Environmental Considerations14:57 Challenges with Older HVAC Systems17:48 Advancements in HVAC Efficiency22:10 The Future of Home Heating Systems23:00 Transitioning to High-Efficiency Furnaces25:04 Navigating Mandates and Regulations28:04 The Rise of Heat Pumps30:07 Cost Implications of New Systems33:21 Maintenance and Longevity of Heating Systems36:15 Investing in Heating Solutions40:08 Women in the HVAC Industry

In this short Q&A podcast, Bryan answers a listener-submitted question about apps for doing proper loads. Fred specifically asks about apps or charts that can help an HVAC contractor determine the insulation value of a home without assuming numbers or drilling into walls during load calculations. Load calculations account for all the ways that BTUs can enter or leave a home: conduction, convection, and radiation. Insulation prevents heat transfer via conduction, so it's important to the load calculation process. High-end HVAC design software like Wrightsoft and Kwik Model 3D will have these features built into them (based on the age and location of the home). ASHRAE's handbook also has tables and data with R-values and U-factors to help you out with Manual J load calculations. RED Calc is an app that allows you to calculate a wall's R-value with measurements, including surface and air temperatures indoors and outdoors. This RED Calc software is available through the U.S. Department of Energy, as is REScheck. The DOE insulation fact sheet is also quite valuable, as are The Engineering Toolbox and materials straight from the insulation manufacturers. The best way to get a comprehensive load calculation is to have a lot of tribal knowledge about how houses are built in your area, analyze energy bills, and combine tools like RED Calc with building performance tests.   RED Calc is available through the U.S. DOE at https://basc.pnnl.gov/redcalc. REScheck is available at https://www.energycodes.gov/rescheck.  ASHRAE's resources are available at https://ashrae.org/technical-resources.  Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.  Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android.   Subscribe to our YouTube channel.  Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android.

In this episode of the "Close It Now" podcast, host Sam Wakefield sits down with Shelby Breger from Conduit Tech to dive deep into the importance of Manual J load calculations in the HVAC industry. They discuss why these calculations are crucial, how and when to use them, and provide a high-level overview of Conduit Tech's innovative software that is disrupting the HVAC industry. This episode is packed with insights on how proper load calculations can enhance efficiency and comfort in HVAC systems.Key Takeaways:Importance of Manual J: Understand why Manual J load calculations are essential for designing efficient HVAC systems.Practical Application: Learn how and when to use Manual J calculations in real-world scenarios.Software Overview: Get a high-level view of Conduit Tech's Manual J software and how it is revolutionizing the HVAC industry.Industry Impact: Discover the broader impact of accurate load calculations on HVAC system performance and customer satisfaction.Guest Bio:Shelby Breger is a CO-Founder with Conduit Tech, a company renowned for its Manual J load calculation software. Shelby brings a wealth of knowledge about HVAC system design and the importance of accurate load calculations.Connect with Conduit:https://getconduit.com/ Shelby@getconduit.comHost Bio:Sam Wakefield is the host of the "Close It Now" podcast and an expert in sales strategies. With years of experience, Sam is dedicated to helping sales professionals understand the psychological factors at play in sales and achieve greater success in their careers.Connect with Us:Website: https://www.closeitnow.net/Facebook: https://www.facebook.com/groups/closeitnowInstagram: https://www.instagram.com/therealcloseitnow/LinkedIn: https://www.linkedin.com/in/closeitnow/Subscribe & Leave a Review:If you enjoyed this episode, please subscribe to "Close It Now" and leave us a review on our Facebook profile or where you listen to this podcast. Your feedback helps us bring you more great content!

This is such a great and extremely informative video. Brian shares what he sees in his industry and why there are so many problems with our HVAC's. One is that the Manual J, Manuel S and Manuel D isn't being performed for each new construction home. This can cause major problems that can lead to mold growth. We discuss why the fan should never be set in the "ON" position and how that can create moisture and mold issues. Is fogging your ducts really helpful? Go check out his full interview.  It will arm you with some great education that we all need to know in order to help prevent our own HVAC's from having moisture and mold issues. More about Brian below:Brian is a very popular HVAC person in Houston and surrounding areas. Not just because he is good at what he does; but because he has taken the time to learn about mold and understand how it can truly impact the health of the occupants of a home when it is causing an IAQ problem. Brian Wright owner of Crossway Mechanical LLC in Tomball TX.Brian haas been in the residential side of the HVAC industry for 28 years.Specializes in Retrofit replacement market.HE is a Nate Certified technician, NCI member and certified : Air balancing certified, Carbon monoxide and combustion analysis, duct system optimization, residential HVAC system performance specialist. He is also BPI certified blower door testing.

Shelby Breger, co-founder of Conduit Tech, joins Bryan Orr on the HVAC School Podcast to discuss her company's innovative lidar-enabled design and sales software tool for HVAC contractors. Conduit Tech's software utilizes lidar sensors in iPads and iPhones to scan homes and create 3D models and 2D floor plans. It overlays load calculations factoring in property data, orientation, cooling/heating degree days, and building materials. This allows contractors to perform detailed load calculations on-site in just 15 minutes or less while engaging homeowners visually. Breger explains that the core goal is to empower contractors to deliver better-designed systems more efficiently while enhancing the customer experience. Homeowners get to see the level of work and customization involved, building appreciation for the contractor's services. The visuals help communicate potential comfort issues and how the proposed solution uniquely addresses their home's needs. Breger emphasizes that Conduit Tech is focused on solving fundamental industry pain points identified through continuous feedback from their contractor user base. The software has evolved to provide more flexibility to adapt to the realities of home visits. New features like augmented reality equipment visualization further enhance the customer engagement capabilities. Topics covered include: How Conduit Tech's lidar scanning and modeling works Using the software for room-by-room or whole home load calculations Integrating data sources like property records, ASHRAE design conditions, etc. Aligning with ACCA Manual J methodologies and certifications Improving load calculation accuracy through real-world monitoring Leveraging technology to streamline processes across sales, design, and installation The value proposition for contractors and homeowners Roadmap for adding features based on user feedback How contractors can get started with Conduit Tech's software   Contractors interested in trying out Conduit Tech can visit https://www.getconduit.com/, or they can email shelby@getconduit.com or info@getconduit.com to learn more and schedule a demo. Learn more about the 5th Annual HVACR Training Symposium at https://hvacrschool.com/Symposium24. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.” Subscribe to our YouTube channel at https://www.youtube.com/@HVACS.  Check out our handy calculators HERE or on the HVAC School Mobile App (Google Play Store or App Store).

Today we talk with HVAC design legend Russ King (https://kwikmodel.com) about how to trim the fat out of heat load calculations in Manual J (and how you sometimes can't), along with fine points on duct design, grille selections, and a brand new movement in software to help homeowners perform their own load calculations (https://DIYloadcalcs.com). Hosted as always by Corbett Lunsford (https://BuildingPerformanceWorkshop.com). See the first-ever TV series about the Science of Homes at: https://HomeDiagnosis.tv

The podcast is a conversation between Ed and Bryan about using the ACCA Residential Plans Examiner Review Form, an ACCA form you probably never heard of, to demonstrate that proper HVAC system design procedures were followed based on the Manual J, Manual S, and Manual D guidelines. Ed introduces the Residential Plans Examiner Review Form as a one-page document that allows contractors to show they gathered the minimum necessary information to complete a proper HVAC system design. The form doesn't teach how to actually do the design calculations but can help explain the design to others not familiar with it, like code officials asking for documentation. The form is meant as a bridge to facilitate communication between contractors and authorities having jurisdiction (AHJs). Ed shares stories of using the form successfully to work with code officials and gain approval. Bryan asks clarifying questions about the intended audience for the form - whether for residential new construction only or also replacement - since it references the duct design Manual D procedures. Ed explains the full manuals would likely only apply to new construction and add-ons, but elements could apply to replacements if load calculations are required locally. The details depend on the specific project and jurisdiction. Topics covered: Purpose and use of ACCA Residential Plans Examiner Review Form Information that the form documents from Manual J, Manual S, and Manual D The form's audience (primarily code officials/AHJs, but it's also helpful for contractors) Applicability for residential new construction, add-ons, and some replacements Stories of working with local code officials using the standard form Where to access online - ACCA website and search by full name   Access the document information and examples online HERE and learn more about ACCA at https://acca.org/home.  Learn more about the 5th Annual HVACR Training Symposium at https://hvacrschool.com/Symposium24. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.” Subscribe to our YouTube channel at https://www.youtube.com/@HVACS.  Check out our handy calculators HERE or on the HVAC School Mobile App (Google Play Store or App Store).

In this short podcast, Bryan talks about air changes per hour, also known as ACH, and what it means in HVAC design and indoor air quality (IAQ) discussions. ACH tells us how frequently the entire volume of air in a room or structure is replaced; we are referring to the cubic feet of air leaving a space and then being replaced within that same space. If we have a balanced number of cubic feet per minute (CFM) of air supplied to and returned from the room in one hour, we would multiply that CFM by 60 to get the ACH, as there are 60 minutes in one hour. ACH should not be used to calculate heat loss and heat gain, even though BTUs are moved with air. ACH is a practical guideline for HVAC design. Ventilation needs will vary based on the purpose of a room and the number of occupants in it, and ACH tends to be a more important factor for determining how we can meet ventilation needs in commercial and industrial structures than in residential structures, in which we mostly rely on Manual J calculations of sensible and latent BTU gains and losses. However, we should not confuse ACH with outdoor air ventilation requirements as described in ASHRAE Standards 62.1 and 62.2. ACH also comes into play when it comes to infiltration and the tightness of an entire structure. When used in the context of blower door testing, the ACH will tell us if a building meets tightness standards. There is also a term called ACH50, which refers to air changes per hour at the standard pressure for blower door testing: -50 Pascals. ACH50 does not reflect ACH under natural conditions (ACH natural).   If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

This episode started in 2018. I have had the notion for quite a while (since 2018) of the need for a responsible contractor network or RCN. This came up when my widowed sister that lives many states away was having trouble with her HVAC system in her home. She asked who I might recommend. I had no immediate answer. I created a few basic principles of conduct, process, and integrity for RCN. I even bought a domain and mentioned the idea a few times (at the HVAC School Symposium) and received some decent response. Then I fell into other rabbit holes. Fast forward to 2023 and I came across a list put forth by Corbett Lunsford: https://homediagnosis.tv/hvac-installers “The List is a voluntary, un-vetted directory of HVAC Installers across North America who will trust and follow, or even perform in-house, design calculations (Manual J, S, and D). These companies have self-selected, by affirming the following questions: I understand that the first step in proper HVAC design is a Manual J (or equivalent) load calculation, targeting the 99% hottest and coldest design temperatures the home will be exposed to I understand that in more airtight, insulated, and ventilated homes the load may prove to be between 1000-2500 sq ft per ton of cooling If I follow the software-based design correctly, I understand that it is not my problem if the home is not as airtight as the builder or client told me it would be, and a simple blower door test can prove that any performance issues are the enclosure's fault rather than my HVAC installations”   Dang, he did it! Then I scrolled through the list (now 51 strong) and saw someone in Pittsburgh where I live! And that's how this episode all started. Oh, and Mat has a very interesting backstory that I think you will enjoy. Mat Stone Mat@home-mechanix.comwww.Home-Mechanix.com   This episode was recorded in August 2023.   PS we referred to Episode 21 with Ed Kisiel Super tight houses using standard construction.  

1. Tl;drMany reports indicate that indoor air quality (IAQ) interventions are likely to be effective at reducing respiratory disease transmission. However, to date there's been very little focus on the workforce that will implement these interventions. I suggest that the US Heating, Ventilation and Air Conditioning (HVAC) and building maintenance workforces have already posed a significant obstacle to these interventions, and broad uptake of IAQ measures will be significantly hindered by them in the future. The impact will vary in predictable ways depending on the nature of the intervention and its implementation. We should favor simple techniques with improved oversight and outsource or crosscheck technically complex work to people outside of the current HVAC workforce. We should also make IAQ conditions and devices as transparent as possible to both experts and building occupants.To skip my bio and the technical horrors section, proceed to the recommendations in section 4.2. Who am I? Why do I think This? How Certain am I? I began working in construction in 1991. I did a formal carpentry apprenticeship in Victoria BC in the mid-90s and moved to the US in ‘99. Around 2008 I started taking greater interest in HVAC because - despite paying top dollar to local subcontractors - our projects had persistent HVAC problems. Despite protestations that they were following exemplary practices, our projects were plagued with high humidity, loud noise, frequent mechanical failure, and room-to-room temperature differences. This led me to first learn all aspects of system design and controls, and culminated in full system installations. Along the way I obtained a NJ Master HVAC license, performed the thermal work of ~2k light-duty energy retrofits, obtained multiple certifications in HVAC and low-energy design, and became a regional expert in building diagnostics. Since 2010 I've worked as a contractor or consultant to roughly a dozen major HVAC contractors and hundreds of homeowners.I'm reasonably certain that the baseline competence of the HVAC workforce is insufficient to broadly and reliably deploy IAQ interventions and that this is a serious obstacle. My comments are specific to the US. I've discussed these problems extensively with friends and acquaintances working at a national level and in other parts of the US and believe them to be common to most of the country. The problems are specific to the light commercial and residential workforce, but not domains that are closely monitored by mechanical engineering teams (e.g. hospitals). Based on some limited experience I suspect these problems are also common to Canada, but I'm less certain about their severity.3. Technical Horrors: Why is This so Difficult?Within HVAC, many important jobs are currently either not performed or delegated to people who are largely incapable of performing them. Many people convincingly lie about their capacity to perform a job they're incapable of, report having done things they haven't, or even make statements at odds with physics.Examples include:Accurate heat load/loss calculations: These are used to size heating and cooling systems, and in most areas are code mandated for both new and replacement systems. Competent sizing (Manual J [...]--- First published: May 29th, 2023 Source: https://forum.effectivealtruism.org/posts/q7dJz9ZaZGTSZL8Jk/obstacles-to-the-implementation-of-indoor-air-quality --- Narrated by TYPE III AUDIO. Share feedback on this narration.

Welcome to The Nonlinear Library, where we use Text-to-Speech software to convert the best writing from the Rationalist and EA communities into audio. This is: Obstacles to the Implementation of Indoor Air Quality Improvements, published by JesseSmith on May 29, 2023 on The Effective Altruism Forum. 1. Tl;dr Many reports indicate that indoor air quality (IAQ) interventions are likely to be effective at reducing respiratory disease transmission. However, to date there's been very little focus on the workforce that will implement these interventions. I suggest that the US Heating, Ventilation and Air Conditioning (HVAC) and building maintenance workforces have already posed a significant obstacle to these interventions, and broad uptake of IAQ measures will be significantly hindered by them in the future. The impact will vary in predictable ways depending on the nature of the intervention and its implementation. We should favor simple techniques with improved oversight and outsource or crosscheck technically complex work to people outside of the current HVAC workforce. We should also make IAQ conditions and devices as transparent as possible to both experts and building occupants. To skip my bio and the technical horrors section, proceed to the recommendations in section 4. 2. Who am I? Why do I think This? How Certain am I? I began working in construction in 1991. I did a formal carpentry apprenticeship in Victoria BC in the mid-90s and moved to the US in ‘99. Around 2008 I started taking greater interest in HVAC because - despite paying top dollar to local subcontractors - our projects had persistent HVAC problems. Despite protestations that they were following exemplary practices, our projects were plagued with high humidity, loud noise, frequent mechanical failure, and room-to-room temperature differences. This led me to first learn all aspects of system design and controls, and culminated in full system installations. Along the way I obtained a NJ Master HVAC license, performed the thermal work of ~2k light-duty energy retrofits, obtained multiple certifications in HVAC and low-energy design, and became a regional expert in building diagnostics. Since 2010 I've worked as a contractor or consultant to roughly a dozen major HVAC contractors and hundreds of homeowners. I'm reasonably certain that the baseline competence of the HVAC workforce is insufficient to broadly and reliably deploy IAQ interventions and that this is a serious obstacle. My comments are specific to the US. I've discussed these problems extensively with friends and acquaintances working at a national level and in other parts of the US and believe them to be common to most of the country. The problems are specific to the light commercial and residential workforce, but not domains that are closely monitored by mechanical engineering teams (e.g. hospitals). Based on some limited experience I suspect these problems are also common to Canada, but I'm less certain about their severity. 3. Technical Horrors: Why is This so Difficult? Within HVAC, many important jobs are currently either not performed or delegated to people who are largely incapable of performing them. Many people convincingly lie about their capacity to perform a job they're incapable of, report having done things they haven't, or even make statements at odds with physics. Examples include: Accurate heat load/loss calculations: These are used to size heating and cooling systems, and in most areas are code mandated for both new and replacement systems. Competent sizing (Manual J for residential) is viewed as highly important by virtually all experts within HVAC. However, despite decades of investment in training and compliance, a lead technical manager of a clean energy program reported to me that >90% of Manual Js reviewed by his program had significant errors made apparent due to internal inconsistency (eg duct load on a hydronic system) or obvious inconsistencies with public information on zi...

Genry Garcia returns to the podcast to talk about pressures in the building envelope, namely the infiltration skeletons behind closed doors. When doing load calculations (Manual J), we need to know how much of the heat load, especially the latent heat load, comes from leakage in the building envelope and the ducts. Opening/closing doors and windows can also worsen the issues that stem from infiltration due to upsetting the balance of pressures in the home. Smoke pencils and other similar tools can give you an idea of the pressure in a home and how it could change when doors open or close. Since there is a lot of room for inaccuracy in extreme climates (especially those with high latent loads), many HVAC systems are oversized and underperform. Some building design features also exacerbate problems presented by oversized HVAC systems. To get the data we need to design systems that mitigate those issues, we need to do a blower door test. Downsizing the tonnage in retrofits or replacements usually has advantages, but it must be done right, and customers may not always want to do that. It's the contractor's responsibility to give them a choice and educate them about the options and what the thorough diagnostic process looks like, including balancing the home and checking the pressure in relation to the outdoors. Genry and Bryan also discuss: Positive and negative pressure in certain rooms Exhaust ventilation and pressurization Using See Stack to see differences in loads Leaving the fan in the "on" position Useful tools Variables in lab-based testing and field testing Getting hung up on the 3 Pascals rule of thumb Leaky rooms vs. whole-home leakage   Learn more about the 4th Annual HVACR Training Symposium or buy a virtual ticket today at https://hvacrschool.com/symposium.  If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Ed Janowiak returns to the podcast to talk about setting realistic customer expectations when designing residential HVAC systems across climates, seasons, and load conditions. Being honest and aggressive is one of the best ways to set realistic expectations, and our load calculations and equipment selection need to reflect that. Manual J calculations must consider non-design days, not just the design conditions, including partial load conditions. Partial load conditions that aren't accounted for may make it more difficult for the HVAC system to control latent heat, potentially leading to moisture problems indoors. We have to set expectations in the summer a bit differently than we set expectations in the winter, and we must account for the equipment type when we create expectations. Heat pumps perform differently than furnaces, and oversized furnaces typically present fewer problems than oversized heat pumps in areas with high latent loads.  Clients must also be willing to acknowledge that systems won't perform exactly as designed during partial load conditions. You can put the information in writing and make clients sign the paperwork to ensure that they understand the expectations you've set. Laying out expectations and making clients read them is a good way to prevent conflict or identify clients that may not accept the expectations. Ed and Bryan also discuss: Ed's three "Hate Me" reasons Oversizing furnaces vs. straight-cool A/C units vs. heat pumps Electrification Heat pumps in cold climates Humid vs. arid climates Designing systems with ancillary dehumidification Not being responsible for clients' lifestyle choices ACCA collaboration and industry support   Learn more about the training ACCA has to offer at https://www.acca.org. Check out the HVACR Training Symposium and order your virtual tickets before, during, or after the symposium (Jan 19-21, 2023) at https://hvacrschool.com/symposium.  If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Alex Meaney returns to the podcast to explain why it REALLY gets hot upstairs and what we can do about it. He also talks a bit about his new business. Heat technically doesn't rise; warm air is less dense than cooler air, so cooler air sinks as warmer air rises. In many cases, people blame stratification and the stack effect for warm upstairs areas, but there may actually be other issues at play, especially if the issue only seems to happen in the summer.  Many apparent convective problems are actually due to building science errors, especially poor insulation when walls are exposed to attic space. When air moves via convection, it brings the heat it contains with it, which can contribute to comfort problems. To help figure out what is going on, try to see what the floor temperature is; a cold floor usually indicates a building design mistake, particularly a joist bag problem.  Some of the solutions that may sound good aren't actually that effective, including placing return ducts higher. In many cases, we have to think about fixing the actual building, not the HVAC system. Some attics that are poorly ventilated and insulated will need to be reinforced. Alex and Bryan also discuss: Mean HVAC Consulting & Design Wind washing and exposure within the insulation R-value Pressurization and how it relates to hot air “rising” Manual J and its shortcomings with significant heat gains/losses Duct design and using a Ductulator Soffit vents, ridge vents, blown-in insulation, and infiltration Why building science skills are important for HVAC technicians Poorly conceived home designs Diagnostic tips and tricks Vapor-permeable air barriers Sizing, capacity, and power consumption   Learn more about what Alex is doing at meanhvac.com.  If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Dr. Allison Bailes, author of the Energy Vanguard blog joins the show to talk about air return ducts. They talk about heating and air conditioning systems. Allison discusses that the most affected are the bedroom and it's important to have a return air pathway to help with better airflow. He then talks about having central return and dedicated return pathways and how to set these systems up. According to him, common methods include door undercuts and transfer grills. Allison also shares about Manual J., a protocol for doing calculations to find the heating and cooling load on the house in the summer and winter. They further talk about the proper sizing of these systems for homes. E-mail us your comments, questions, and suggestions at podcast@structuretech.com.

Neil Comparetto and John Semmelhack of the Comfort Squad join Bryan to discuss high-quality value design in a high-performance home. They explain how they design HVAC systems (heat pumps) for low-load homes in ways that are affordable, efficient, and comfortable. High-performance, low-load homes need to be energy-efficient AND comfortable, and it can be a challenge to get both. Manual J calculations aren't as common as they probably should be, and it can be difficult to get accurate data about air leakage, power consumption, and radiant gains as well. So, John and Neil try to collect their own data and do aggressive load calculations to avoid the fudge factors that are all too common. The air velocity inside the ducts tends to be lower in these sorts of systems. When you have relatively low airflow in the ductwork of high-performance homes, you don't need as many ducts or for the ductwork to be particularly large. With minimalistic ductwork, supply register placement, face velocity, and throw become very important, especially because those factors are responsible for air mixing. When the duct design conditions are right and the load has been matched, you typically get long runtimes and good air mixing. In many cases, John and Neil use variable-speed motors in their outdoor units that allow for high heating performance. The capacity ranges are wide, allowing the units to run even during exceptionally low-load conditions. They also use flex ducts due to their pre-insulation, noise suppression, and inexpensiveness; they just try to keep it sealed and avoid compressing the ductwork.  Neil, John, and Bryan also discuss: Monitoring load conditions with software Design considerations for filter grilles and central returns Room pressurization and airflow testing Transfer grilles The Coanda effect and curved-blade registers Vent sizing Flex duct installation best practices Duct fittings ERVs   If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

This podcast is a class that Bryan taught for BTrained in Birmingham, AL. He covers troubleshooting, installation, and commissioning best practices with a focus on the fundamentals. To be a good troubleshooter, you must be able to find the problem, identify the source of the problem, fix the problem, and optimize performance based on your data, the customer's comments, and your observations. The Five Pillars of diagnosis aren't comprehensive diagnostic or charging criteria, but they can help you charge or diagnose a system. Isolation diagnosis works best for electrical components; you isolate the problem area from the system and see how the system works without the suspected issue. If the system operates normally without the component in question, then we can conclude that our hypothesis about the “problem” part was correct. Wide-narrow-wide troubleshooting is an approach that allows you to inspect the entire system, zero in on the problem, and optimize the entire system. By starting wide, going narrow, and going wide again, you can troubleshoot holistically. Installations take place in several phases: pre-planning, planning, demo, installation, and commissioning. Many people place a lot of emphasis on the demo and installation and neglect the conversations and procedures associated with pre-planning, planning, and commissioning. Bryan also covers: Heuristics and mental shortcuts Evaporation vs. boiling Rules of thumb Head pressure, suction pressure, and compression ratio Energy transfer fundamentals What superheat and subcooling really indicate Restrictions and temperature drop Delta T “Redneck” compressor test Testing circuits Useful measurements and test instrumentation Causes of compressor failure Measuring airflow Low vs. high static pressure Bringing tribal knowledge to building design Ductless systems, ventilating dehumidification, and sensible heat ratio Manual J, attics, and combustion air Radiant barriers and heat transfer Supply relative humidity Dehumidifier configuration and system design Bad envelopes Vented attics Duct upgrades Total effective length and turning vanes Evacuation   Learn more about BTrained at https://btrained.net/ or on the BTrained YouTube channel at https://www.youtube.com/channel/UCnlDsWHT68gVwPrYYO5vhrw.  If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE.

Russ King joins us for a short podcast episode about using 3D load and energy calculations with duct design. Russ has developed the Kwik Model 3D software program with the help of his son, Connor. Kwik Model 3D uses a video game platform to build a house out of boxes instead of a sketch. The software has evolved and been integrated into EnergyGauge to do load and energy calculations based on a house's geometry. Kwik Model makes it easy and fun to create that geometry profile for a home, which makes building design and load calculation attractive to technicians. Software like Kwik Model may especially become popular as Generation Z steps into the workforce; we can expect the learning curve to be quite shallow for the digital generation. The Manual J calculation uses the home's characteristics in Kwik Model and does all of the mathematical calculations in EnergyGauge for an advanced load calculation. KwikModel then receives those calculations for each room. Then, you can draw the ductwork and use an auto-size function to get the proper duct size based on the calculations. Energy simulations use several load calculations with advanced data to figure out what the energy usage will look like in a home with a certain set of load conditions. Russ and Bryan also discuss: Modeling quickly with Field Draw How building materials impact load calculations and energy simulations Energy simulations vs. load calculations Upcoming events with Russ King Kwik Model's tech support Using the Unity platform to develop software for many different industries   Learn more about the software and get your 30-day free trial at kwikmodel.com.  If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE. Check out our handy calculators HERE. Check out information on the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.

The Boys get with Wes Davis from ACCA and veteran of the industry to discuss Manual J and more.

In today's short podcast, Bryan explores the differences between startup and commissioning.   Startups typically involve going in during the construction phase after the drywall has been sealed up. (Vents, ducts, and copper piping typically go in before the drywall.) A technician can then perform a startup. The startup includes testing the drain line, checking the charge, checking for leaks, and seeing if the equipment performs its most basic function. (Does the gas furnace make flame? Does the A/C unit blow cold air?)    The startup's goal is to get the equipment working. A startup does NOT focus on peak performance. A good startup will typically suffice for a cookie-cutter residential construction.    Conversely, the goal of commissioning is to optimize the equipment and test the advanced functions. Combustion analysis, airflow tests, and dehumidification tests all fall under the “commissioning” umbrella. Commissioning is where we use Manual S and Manual J to see if the equipment is appropriate for the home. Data collection, especially on sensible and latent capacities, is the core element of commissioning.    Commissioning also involves checking up on secondary functions, such as checking if heat strips activate during defrost. A custom construction plan will require commissioning to ensure that the equipment runs optimally in the uniquely designed space.   So, in short, equipment startup is about making sure the equipment works as it should on a basic level. On the other hand, commissioning uses data and specific instrumentation to make sure the equipment is running to its design and full potential.   Bryan also covers:   Stages of residential construction Startup in new construction projects Capping and filling drains Who can perform a startup? (Junior techs, installers, senior techs, etc.) Instrumentation for commissioning If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.

In today's podcast, Nikki and Bryan discuss dehumidification. They cover the relationship between cooling and dehumidification, humidity control, and dehumidifier installation practices.   If the A/C unit is the king, the dehumidifier is the queen. The A/C unit controls cooling and humidity, but it can only do so much. A dehumidifier helps the A/C manage comfort under more demanding conditions. Many factors contribute to comfort, including sensible heat ratio (SHR), relative humidity (RH), and ventilation. Dehumidification reaches all of those factors.   Humidity control requires a holistic approach. Band-aid fixes DO NOT work. Dehumidifiers should work with the A/C system and building design to keep RH in the 50-55% range. Proper installation is vital. For example, tying into the HVAC supply is a recommended practice. Returns are the opposite; dedicated returns are preferred. Other factors to consider are proper sizing, Manual J, and customer expectations.   Join Nikki and Bryan as they cover:   Relative humidity targets Sensible heat ratio (SHR) Latent removal capacity Ventilation Building design and tightness Manual J Challenges with ductless systems Ducting into the supply with dedicated returns Installation practices Dehumidifier sales and customer service   And much more…   To learn more about Santa Fe Ultra series, go to www.santa-fe-products.com. You can scroll through the products to find the Ultra series free-standing ventilating dehumidifiers. If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.

Today we welcome David Marrs from Marrs HVAC Services to the show! David is a very impressive individual with a wealth of knowledge and if you follow him on social media you'd know it's in more than just HVAC! It's his growth as a business owner that we dove into today as he and his team are set to have their biggest year ever in 2021! Today we got into:What is the biggest obstacle in the industry that you see today with Manual J's?What should an HVAC business owner do to take their business to the next level?With the importance of content on social media where should people post and what should they say?What is the most amazing physical feat you have been able to successfully pull off?How can people break thru barriers in their business?Should you have a business diary?What is one thing you wish you could stop doing? Start doing? And continuing to do in your business?How To Find Davidhttps://facebook.com/marrsmanualj/ https://marrsdesign.learnhownow.com/ Facebook Group: https://www.facebook.com/groups/hvacrevealedFacebook  Page: https://www.facebook.com/hvacrevealedYoutube: https://www.youtube.com/channel/UCympmrPnT_5MZxEAEyyv2rwOur Website: https://www.onpurposemedia.ca

How do you add a slab to a Rescheck? Manual J, Manual S, Manual D, Comcheck

Is Google Nest Thermostat Replacing Multiple Unit and Zone Needs?  Google Pixel Rescheck, Google Pixel comcheck, google pixel Manual J, google pixel manual S, google pixel manual d, Google Nest Thermostat Rescheck, Google Nest Thermostat Manual J, Google Nest Thermostat Manual S, Google Nest Thermostat Comcheck, Google Nest Thermostat Manual D

Climate Zone 4 Rescheck needs to be Climate Zone 5 Manual J Manual S Manual D Comcheck

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IECC 2018 Rescheck Web PDF Error Messages Now Repaired. Manual J. Manual S. Manual D. Manual J Heat Loss IECC 2018, Manual S Equipment Sizing ACCA, ACCA Manual D Duct Layout, ACCA Manual D Duct Sizing

Which IECC code sees the most Reschecks? Manual J Heat Loss, Manual S Equipment Sizing, Manual D Duct Layout, Manual D Duct Sizing

Ranking IECC Codes in Rescheck Web and Desktop. Rescheck, Comcheck, Manual J Heat Loss, Manual S Equipment Sizing, Manual D Duct Layout, Manual D Duct Sizing

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What is Rescheck Stuffing?www.Rescheck.info, Manual J, Manual S, Manual D

Troubleshooting Rescheck Software Work Arounds, Manual J, Manual S, Manual D, Comcheck

What is the Intrinsic Value of a Rescheck? Manual J, Manual S, Manual D, Comcheck

Alex Meaney from Wrightsoft joins us to talk about Manual J and S and how that applies to real world situations where contractors are tempted to replace “Like for Like”. Use the offer code POD2019 for a great discount on Wrightsoft products at Wrightsoft.com

Nathan Rothenberg and Ed Janowiak join me on the podcast to talk the good the bad and the uncomfortable of ACCA manual J D & S

Puedo hacer el REScheck mi mismo Rescheck, Manual J, Manual S, Manual D, Comcheck

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We discuss why it is so important to get a heat load calculation - either a Manual J or Manual S - before installing any HVAC job with Mark Guenthner.

Phil Valpey is back on "Torrice Tech Talk" to discuss the information needed for a Manual J - the correct way to size a new system in a home.

In this week’s episode, I have some helpful strategies that we can use to keep the inside and outside of our homes cooler and more comfortable during the hot summer. I did some research on what we can add to our homes that will make high outdoor temperatures more bearable.  I’m talking about things we can include in and around our homes beyond an energy efficient air conditioner for our houses that have been sized according to Manual J calculation.  We’ll discuss things like awnings, outdoor solar shades, solar screens and other shading products, outdoor fans, misting systems, swamp coolers and outdoor portable air conditioners. And since not all cooling systems work well in all climates, I’ll tell you which ones are best for dry heat and which are better for hot, humid climates. Show notes at BYHYU.com

We talk with system and duct design educator Jack Rise about ACCA Manual J load calculation and Manual S system selection

In this episode of The Building Science Podcast, we interview the great Dr. Allison Bailes of Energy Vanguard Blog about all things HVAC. From Dr. Bailes world renowned blog, Energy Vanguard: Allison Bailes, III, Ph.D."It took me a while, but I've finally figured out how best to use my PhD in physics (University of Florida, 1998). I've always loved science, and I started off on the traditional academic path after graduate school, but that wasn't really enough for me. I loved teaching, but I needed to find a way to use my interest in energy and the environment as well as my love of buildings, especially houses.A lot of little steps along the way brought me to where I am now:Reading The Integral Urban House in the '80sBuying the Real Goods compendium the Alternative Energy Sourcebook (now called the Solar Energy Sourcebook) in the early '90sSubscribing to Home Power magazine in 1994Building and using a solar cookerServing on the Gainesville Energy Advisory Committee while in grad schoolWatching (and helping a little bit) my PhD thesis adviser build an off-the-grid solar house in FloridaWhat really started the ball rolling for my new career and the founding of Energy Vanguard, though, was when I built a house myself. In 2001, I bought a piece of land and spent the next two years building a green home that's beautiful, efficient, and comfortable. Having never built anything bigger than a bookcase prior to taking on this project, I had a steep learning curve in front of me—and I loved it!After finishing the house in 2003, I became a home energy rater and left academia for my new career in the field of high performance homes. My first business was called ab3 energy, and I offered home energy ratings and building science consulting. When that turned out not to be enough to keep the business afloat, I started offering Manual J heating and cooling load calculations, and I even got into the contracting business. I did air-sealing, duct-sealing, insulation, and crawl space encapsulation to provide homeowners with a comprehensive package to improve their home's performance.That business was going well when life threw some curve balls at me, so I ended up going to work for another home performance contractor (The Hoots Group) in Atlanta. I learned many new business and contracting skills, and then got the opportunity to work for one of the premier energy efficiency and green building organizations in the country—the Southface Energy Institute. At Southface, I started off as the regional manager for the EarthCraft House program and then also became the manager of Southface Energy Rated Homes, their HERS rating providership. Again, I learned a lot there that would have been much harder to learn on my own.In 2008, I decided that I really wanted my own company again, so I left Southface and started Energy Vanguard. In some ways, this company is a continuation of ab3 energy, but it's also a lot more than that. Energy Vanguard is more about teaching and less about fixing, although we do offer HVAC design services. It's focused more on the big picture—creating markets, spreading the word (such as for Energy Efficient Mortgages), expanding networks—and less on individual components. I see this company as being on the forefront of change—the vanguard—in the way we see and use energy in our homes.It's been a bit of a winding path, but I'm doing what I love now and feel that I've finally figured out how to combine my interests, skills, experience, and education in a way that lets me serve clients to the best of my ability. The fact that Energy Vanguard is growing in a down economy is testament that I've made good choices. It's also evidence that you can succeed in this field as well. There's plenty of room for growth here.Please let me know how Energy Vanguard can help you, whether it's with training, as your HERS rating provider, or with some other building science related need you have."-- Allison A. Bailes III, PhD