Hvac School - For Techs, By Techs

In this short podcast episode, Roman Baugh takes over the HVAC School podcast to answer a listener-submitted question about VRF (or VRV) system evacuation. Evacuation is a critical step of making repairs on VRF systems, which are very diverse and versatile but require a high level of understanding. VRF systems have multiple indoor units per outdoor unit, and they achieve that with the help of several components and accessories down the refrigerant line that can pose issues in evacuation and pressure testing. In heat recovery units, some manufacturers use solenoid valves (or even electronic expansion valves) in branch selector boxes or branch collector boxes. These valves act as little traffic guards, and the system needs to be put in its refrigerant recovery or vacuuming mode. If not, then you won't be able to evacuate all of the refrigerant and non-condensables from the system. Even if the system passes a decay test, contamination is a major concern when the system starts up and the valves open (due to nitro

This podcast episode is of Bryan's session from the HVAC School Symposium, "10 Things I've Learned in the Last 10 Years." Delivered as HVAC School approaches its 10-year milestone and Kalos hits 20 years, Bryan blends technical know-how with personal stories, revealing how his “expertise” is a product of constant learning—often from the very audience he’s addressing. Bryan’s presentation weaves together practical HVAC lessons and relatable anecdotes, offering a glimpse into his growth as a technician, educator, and leader. He tackles wire sizing versus breaker sizing, debunking outdated myths tied to the National Electrical Code and sharing tales of sparring with inspectors over code-compliant innovations. On vent sweating and duct leakage, he provides actionable fixes—like sealing boots and tackling attic moisture—while urging techs to look beyond bandaids. Bryan also dives into coil corrosion, distinguishing formicary from galvanic causes and advocating for field-driven research over manufacturer spin. His

In this short podcast episode, Bryan answers a listener-submitted question about using R-290 as a drop-in refrigerant for R-22 systems. It is NOT safe to use R-290 as a drop-in, but there are some similar properties between the two and some interesting thought experiments within this topic. R-290 is propane, a hydrocarbon that belongs to the family of natural refrigerants. R-22 is an HCFC refrigerant that has undergone a manufacturing/importation phaseout in the USA. They are both single-component refrigerants, not blends. Both of them have similar operating pressures and oil carry. However, the latent heat of vaporization of R-290 is almost double that of R-22, which makes it extremely effective as a refrigerant. The main issue with using R-290 is that it is highly flammable and explosive (A3), and it has very small charges (500 grams). Around 2010, some people started selling R-290 blends as drop-in alternatives for R-22. In theory, that combination would work very well, but it is not a safe or legal option

In this episode of the HVAC School Podcast, host Bryan welcomes Jeff from Copeland to discuss the critical topic of flooding and slugging in compressors. Jeff, calling in from frigid Minnesota (at negative 19°F), explains the differences between these harmful conditions and how they can damage compressor systems. The conversation begins by differentiating between flood back and flooded starts. Flood back occurs during system operation when control of the evaporator is lost, often due to airflow issues. Flooded starts happen after the system has been off, when refrigerant migrates to the compressor oil. Both conditions can lead to slugging - when liquid refrigerant enters the compression chamber, causing immediate damage to valves and internal components. While flood back and flooded starts may cause gradual damage over time, slugging can break compressor components instantly. Jeff emphasizes that proper superheat levels are essential for compressor health, with most Copeland compressors requiring about 20 deg

In this short podcast episode, Bryan answers a listener-submitted question: what is the best brand of equipment for residential new construction? A lot of people have their own personal preferences when it comes to brands, whether that's with equipment, tools, or even cars. However, when it comes to HVAC equipment, there are a lot of factors that come into play, especially as far as local support is concerned. Are the distributors and territory managers accessible? Reliable? Bryan's personal preferences deal a lot with American (or at least North American) manufacturing and the strength of their local support in the Central Florida market. Some manufacturers have excellent base products but weak product lines, and others have weak base products but great specialized equipment. These judgments come from personal experience, and that's especially true of large manufacturers. Bryan recommends taking a measured, slow approach to products you deal with and then choosing the one that works best for your market and

Join Bryan Orr and Furman Haynes from WorkHero for a great discussion about how to keep HVAC local and help more small owners succeed. Live from AHR Expo 2025, we get to hear from one of the founders of an exciting new company that is offering expert office management that small HVAC business owners can afford. Bryan also talks with Furman about a survey that HVAC School and WorkHero recently conducted that received over 1,300 responses and yielded fascinating data about the day-to-day challenges of running HVAC businesses. Key topics covered: The challenges small HVAC business owners face with administrative work How the average small business owner spends 15.4 hours per week on non-revenue generating tasks The impact of private equity consolidation on local HVAC businesses How AI and human expertise can work together to support small contractors The importance of preserving craftsmanship and technical excellence in local HVAC businesses Ways to help small business owners focus on growth while reducing admi

In this livestream MeasureQuick Talks with Bert. This is an impromptu Talk with industry leaders, including Shelby Breger from Conduit and Joe Medosch from MeasureQuick, about how mobile technology is revolutionizing HVAC diagnostics and training. Featuring special guests discussing how modern tools like MeasureQuick and other diagnostic apps are making it easier for technicians of all experience levels to perform advanced diagnostics and build customer trust. Key Topics: How technicians can leverage mobile technology for better diagnostics Using tablets and phones for real-time HVAC measurements Making technical data accessible and meaningful for customers Bridging the gap between experienced techs and new talent The future of HVAC diagnostics and training How technology can help attract new talent to the trades Recorded live at AHR Expo 2025 with special guests from MeasureQuick and other industry leaders. Whether you're a seasoned pro or new to the trade, learn how modern diagnostic tools can help take y

Join us as we sit down with Nick from Inficon at AHR Expo 2025 to discuss the latest innovations in Leak Detection Tech. We explore the evolution from halide torches to modern infrared sensors, and get an exclusive look at their newest product - the D-TEK Pro. Key topics covered: The transition from heated diode to infrared sensor technology Deep dive into the Stratus leak detector's cloud hunting and pinpoint modes First look at the new D-TEK Pro with 10x airflow and enhanced sensitivity Discussion of forming gas applications in leak detection Tips for proper leak detector usage and maintenance New accessories for wind protection and insulation penetration Whether you're a seasoned tech or new to the trade, this conversation covers essential knowledge about modern leak detection tools and techniques. Learn how these advances are making leak detection more reliable and efficient for HVAC/R professionals.   Find out more at www.inficon.com.  Have a question that you want us to answer on the podcast? Submit y

Join Bryan Orr as he goes Live from the AHR Expo 2025 at the Orange County Convention Center with Kalos Services team members Dre and Elliot! They share their first impressions of the massive HVAC industry expo, discuss interesting booth displays, and chat about the latest tools and technology they've spotted on the show floor. Get their perspective on what it's like to attend one of the largest HVAC/R trade shows in the world, featuring over 60,000 industry professionals from around the globe. The team discusses everything from impressive industrial equipment displays to innovative tools like Fieldpiece's new all-in-one leak detector. Special guest appearances and impromptu conversations with other industry professionals make this casual livestream a fun peek into the energy and excitement of AHR Expo 2025!   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 Symposiu

In this engaging episode of the HVAC School Podcast, host Bryan sits down with Jesse from NAVAC to dive deep into the evolving landscape of refrigeration technology, focusing primarily on the transition to A2L refrigerants. The conversation offers a refreshingly pragmatic approach to addressing industry concerns about these new, mildly flammable refrigerants, dispelling myths and providing practical insights for HVAC technicians. The discussion begins by addressing the most pressing question for many technicians: Do you need to buy all new tools to work with A2L refrigerants? Jesse from NAVAC provides a nuanced response, emphasizing that while there are currently no regulations mandating new equipment, the company has proactively developed tools that are safety-certified and compatible with the new refrigerant types. They explore the intricacies of safety certifications like UL and CSA, explaining the differences between UL Listed and UL Verified, and highlighting the importance of intrinsically safe equipmen

Roman Baugh and Donald Falese from VRF Tech Talk podcast takeover the HVAC School booth at AHR EXPO 2025. Join them as they talk about the new VRF products being unveiled, water cooled VRF up's and down's and why VRF is such a difficult trade work in. You will not want to miss this one! Highlights include: Daikin's innovative modular air handler for residential applications Hisense's groundbreaking single-phase VRF system with integrated hot water heating New NFC technology for easier system diagnostics and commissioning Updates on vapor injection technology and inverter developments The emergence of air source heat pump chillers Latest innovations from manufacturers like Gree, TCL, Cooper Hunter and more Whether you're a seasoned VRF technician or just getting started with inverter technology, this discussion covers everything from basic principles to cutting-edge developments in the industry. Roman and Donald break down complex technologies into understandable concepts while sharing their firsthand experi

Join us for a candid conversation with Bill Spohn from TruTech Tools at AHR Expo 2025! Bill shares exciting news about his planned retirement and transition plan for TruTech Tools, plus gives his insights on this year's 6th Annual HVAC/R Training Symposium where TruTech Tools was the title sponsor. We discuss the unique community atmosphere of both the Symposium and AHR Expo, exploring what makes these events special for the HVAC industry. In this livestream, we dive into: Bill's announcement about transitioning TruTech Tools leadership to his son over the next 3 years A detailed recap of HVAC School Symposium and what made it successful Thoughts on building authentic industry communities and fostering connections Leadership insights and maintaining vision while giving team members agency Perspectives on AHR Expo 2025 and why it matters for HVAC professionals    Don't forget to use offer code GETSCHOOLED for a great discount at trutechtools.com! Have a question that you want us to answer on the podcast? Sub

In this informative podcast episode, Bryan from HVAC School is joined by Louise Keller, the National Training Manager for UEI Test Instruments, to discuss the critical importance of carbon monoxide safety and proper combustion analysis. The conversation begins with lighthearted banter about the previous night's Tactical Awards ceremony before diving into the serious topic of CO dangers and detection. Louise shares valuable insights about the dangers of carbon monoxide exposure, particularly at lower levels that might not trigger standard home CO alarms. She explains that CO poisoning can mimic many other conditions, including early-onset Alzheimer's, traumatic brain injury, and mobility issues. Bryan adds historical context by recounting how many Victorian-era "ghost stories" and fainting episodes coincided with the introduction of gas lighting in homes, suggesting these phenomena were likely CO poisoning symptoms. He also shares the little-known story of Walt Disney's parents, who tragically died from carbon

In this episode of the HVAC School podcast, Bryan sits down with James and Jeff from Copeland to discuss the evolution and capabilities of Copeland's mobile applications, particularly focusing on the Copeland Mobile app and the new Scout feature. James, who has been with Copeland for 28 years, and Jeff, who works as a trainer, share their extensive knowledge about how these tools can benefit HVAC technicians in the field. The conversation begins with a historical perspective on Copeland's service bulletins, which have been a valuable resource for technicians since the 1980s. The guests explain how these bulletins have evolved from being difficult to access to becoming readily available through the Copeland Mobile app. They discuss how the app has become an essential tool for technicians, allowing them to access critical information about compressors, including operating envelopes, current draw specifications, and troubleshooting guides. The discussion then moves to the exciting new features in the Copeland Mo

In this episode, Bryan is joined by guests Jacob and JD to discuss quality control (QC), punch out procedures, and best practices in HVAC installation and service. The conversation delves deep into the various aspects of maintaining high standards in workmanship, from aesthetic considerations to technical performance metrics that affect system longevity. The discussion begins with an exploration of workmanship quality and how to instill pride in work among team members. The guests share insights about the importance of company culture in maintaining high standards, emphasizing that quality control isn't just about catching mistakes but about fostering an environment where everyone takes ownership of their work. They discuss how photo documentation can be a powerful tool for quality control, allowing team members to review work remotely and catch issues that might be missed in the field. The conversation then shifts to the more technical aspects of quality control, particularly focusing on procedures that affe

In this short podcast episode, Bryan covers some common mistakes when measuring static pressure. Static pressure is balloon pressure, not CFM or velocity pressure, but it can be an airflow indicator. The best way to start learning about static pressure is to start measuring total external static pressure. Gas furnaces and heat pumps are different; static pressure is rated at the furnace in the former (not the cased coil, which is additional), and the static pressure includes the coil in a heat pump. The highest static pressure will always be at the blower, but restrictions on either side of the blower will raise static pressure on both sides of the blower.  Dirty components can drop the total external static pressure, which is a common point of confusion that can lead to misdiagnosis. You'll want to determine static pressure at the blower and across components. If you want to determine if a cased evaporator coil is clogged, you can measure the static pressure drop across the coil (by measuring below and above

In this insightful discussion at AHR 2025 in Orlando, Bryan connects with Nikki Krueger from Santa Fe dehumidifiers, exploring the evolution and importance of whole-house dehumidification in modern HVAC systems. Nikki, who has spent 20 years in the indoor air quality industry, shares her journey from a public relations background to becoming deeply involved in the technical and engineering aspects of dehumidification technology. She highlights the groundbreaking work of Ken Gehring, who invented whole-house ventilating dehumidifiers in the mid-1990s and continues to be actively involved in the industry at 84 years old. The conversation delves into the changing landscape of home construction and its impact on dehumidification needs. As houses become tighter due to building codes and energy efficiency requirements, the relationship between air conditioning and dehumidification has become more complex. They discuss how modern, high-efficiency AC systems often struggle with effective dehumidification due to their

In this special episode from the 2025 AHR Expo, Bryan brings us two fascinating conversations with industry leaders who are shaping the future of HVAC technology and tools. The episode kicks off with Tony Gonzalez from Fieldpiece celebrating their 35th anniversary. Tony shares his remarkable journey from packaging meters in the warehouse to his current leadership role, providing unique insights into the company's evolution. The discussion explores Fieldpiece's pioneering role in developing HVAC-specific testing equipment, particularly highlighting their groundbreaking HS26 meter that filled a crucial gap in the industry when no other company was creating specialized meters for HVAC technicians. The conversation with Tony delves deep into the technical aspects of modern HVAC work, particularly focusing on combustion analysis and its three fundamental pillars: safety, efficiency, and consistency. Tony explains how Fieldpiece's JobLink system has revolutionized the way technicians document their work and communi

In this episode, Bryan speaks with Manly, an HVAC professional from Manitoba, Canada, about his journey from working in his family's plumbing business to running his own HVAC company. Manly shares his experiences working in extreme cold weather conditions, where temperatures can drop to -30°C (-22°F), and discusses the unique challenges and emergency response strategies required in such a heating-dominated market. The conversation delves deep into the ethical aspects of running an HVAC business, with both Bryan and Manly sharing their Christian perspectives on business ethics, customer service, and professional integrity. They discuss the importance of honest communication with customers, admitting mistakes, and making decisions based on customers' needs rather than purely financial motivations. Manly emphasizes how his faith influences his business practices and decision-making, particularly when advising customers about repairs versus replacements. The discussion also explores the importance of continuous l

In this short podcast episode, Bryan talks about EER (Energy Efficiency Ratio) and SEER (Seasonal Energy Efficiency Ratio) and how to calculate EER in the field. EER and SEER are ratings that we often see on equipment (as are SEER2 and EER2) based on a ratio of an output to an input. Whereas coefficient of performance (COP) is a direct ratio of watts out to watts in, EER and SEER account for BTUs and watts. EER and SEER indicate the cooling capacity (in BTUs) we get from the watts we put in. The ratio changes based on field conditions, and EER2 and SEER2 have more realistic test conditions than EER and SEER (the static pressure for systems rated below 65,000 BTUs per hour was 0.1"wc for EER and SEER, and it is now 0.5"wc for EER2 and SEER2, which is much closer to average field conditions). To determine EER, you have to figure out BTU production and stack it against your wattage. You'll need to know your delta enthalpy (delta H), multiply it by the CFM, and then multiply the product of those by 4.5 to get you