Building HVAC Science

In this episode of Building HVAC Science, hosts Bill Spohn and Eric Kaiser welcome Sophie Ashley of Energy Vanguard, an HVAC designer with a background in carpentry and building science. Sophie shares her journey from hands-on construction work to HVAC design, emphasizing the critical integration of mechanical systems and building structures. She discusses the importance of feedback loops with installers and her experience performing HERS ratings in the field. Sophie also highlights the shift toward high-performance homes, the growing adoption of heat pumps, and the evolving role of ventilation strategies like ERVs. She provides insights on overcoming industry challenges, the need for better collaboration between trades, and the importance of attracting more women to the field. Wrapping up, she encourages continuous learning and engagement in the HVAC community, emphasizing the rewarding nature of the industry. Energy Vanguard website: https://www.energyvanguard.com/ Sophie on LinkedIn: https://www.linkedin.com/in/sophie-ashley-6b531119a/   This episode was recorded in February 2025.

In this episode of the Building HVAC Science podcast, host Eric Kaiser is joined by Keith Gifford, Senior Global Product Manager at Penn Controls, for an in-depth discussion about the emerging use of A2L refrigerants in the HVACR industry. A2Ls are a new class of refrigerants classified by ASHRAE as mildly flammable and boast a significantly lower global warming potential (GWP) compared to traditional refrigerants. Keith shares his unique perspective, shaped by extensive experience across all major refrigeration components, to explain the challenges, opportunities, and safety considerations surrounding A2Ls. Key topics include the design and engineering hurdles posed by A2Ls, such as material compatibility, flammability mitigation, and the development of leak sensors calibrated to specific refrigerants. Keith also addresses the impact on service technicians, building codes, and system designs, emphasizing the importance of industry-wide education to ensure safe and effective adoption. Finally, Keith reflects on the future of refrigerants, including the potential for CO2 and other environmentally friendly solutions, signaling that innovation in HVACR is far from over. PENN Controls: https://www.penncontrols.com/ AHRI A2L Building Code map: https://www.ahrinet.org/a2l-refrigerant-building-code-map-us SNAP Rule 26: https://www.epa.gov/system/files/documents/2024-05/snap-final-rule-26-factsheet.pdf ASHRAE New Refrigerant Safety Designations and Classifications: https://www.ashrae.org/file%20library/technical%20resources/bookstore/factsheet_ashrae_english_november2022.pdf Keith on LinkedIn: https://www.linkedin.com/in/keith-gifford-519bb73/     This episode was recorded in January 2025.  

In this episode of Building HVAC Science, Bill Spohn and Eric Kaiser, along with the TruTech Tools team, recap their experiences at the 6th Annual HVACR Training Symposium and AHR Expo in Orlando, Florida. They share insights from meeting industry professionals, attending educational sessions, and exploring the latest HVAC tools and technology. The team discusses key highlights, including the impact of Second Chance University, the HVAC Tactical Awards, and the High-Performance Hangout, emphasizing the strong sense of community within the industry. The team also dives into standout products showcased at AHR, such as Testo’s new thermal imaging cameras, Inficon’s D-TEK Pro leak detector, and NAVAC’s latest digital manifold. They touch on the increasing role of technology in HVAC, including EEV Mate’s electronic expansion valve tool and advancements in vacuum pumps and refrigerant scales. Finally, they reflect on the growing educational initiatives in HVAC, such as the Grit Foundation’s efforts to introduce young people to the trades and the launch of Better HVAC, a nonprofit that fosters ethical practices and knowledge-sharing. Whether you attended the events or missed out, this episode provides an engaging recap of what’s shaping the HVAC industry in 2024. Tune in to hear firsthand experiences and takeaways from some of the most significant gatherings in the field!   Two things we missed: The Third US HeatPumpSummit is on tap for this November in Massachusetts. https://www.usheatpumpsummit.com/   Our friends at www.WorkHero.pro ran a survey in conjunction with the www.HVACRSchool.com to look at the day-to-day realities of running a small HVAC business. See the survey results here: https://www.workhero.pro/blog/report   Sue on LinkedIn: https://www.linkedin.com/in/suzanne-bertsch-962496174/ Josh on LinkedIn: https://www.linkedin.com/in/josh-crawley-20b41550/ Bill, Jr. on LinkedIn: https://www.linkedin.com/in/billy-spohn-jr-a06201a3/ Eric on LinkedIn: https://www.linkedin.com/in/eric-kaiser-323a1563/ Bill, Sr. on LinkedIn: https://www.linkedin.com/in/billspohn/   2nd Chance University: https://2ndchanceuniversity.org/   www.BetterHVAC.org                     HVAC Tactical: https://hvactactical.com/   www.TheGritFoundation.com   https://hvacrschool.com/events/6th-annual-hvac-r-training-symposium/   The NCI Summit: https://www.gotosummit.com/ This episode was recorded in February 2025.  

In this episode of Building HVAC Science, Eric Kaiser and Bill Spohn welcome Craig Migliaccio, the creator of AC Service Tech, author, educator, and industry influencer. Craig shares his journey from teaching HVAC in high school to becoming a prolific author and content creator, driven by a passion for making practical, hands-on learning accessible to HVAC professionals and students. With over 60,000 copies sold of his first book and a rapidly growing suite of resources, Craig has made an indelible mark on the industry. Craig discusses the challenges and rewards of writing technical books, the value of bridging the gap between theory and practice, and the immense effort involved in producing educational materials. His team-driven approach and dedication to quality are evident in his books, training tools, and YouTube channel, which boasts over 500,000 subscribers. Craig also emphasizes the importance of work-life balance, family, and faith, encouraging listeners to prioritize their well-being alongside their professional goals. Craig’s motivation to write came from gaps he observed in existing HVAC textbooks, leading him to create step-by-step, procedure-focused resources. Building a robust educational platform requires collaboration, persistence, and a willingness to iterate and improve. Craig’s advice to technicians: prioritize family, invest in knowledge and skills, and focus on meaningful connections in the industry. Craig’s YouTube Channel: https://www.youtube.com/@acservicetechchannel Craig’s books at TruTech Tools: https://trutechtools.com/ac-service-tech/ And his newest book can be found here: https://trutechtools.com/ac-service-tech-refrigerant-charging-and-service-procedures-2nd-edition/ His website: https://www.acservicetech.com/ EP 74 with Craig from 2022: https://www.buildinghvacscience.com/ep74-where-you-can-go-with-passion-and-persistence-with-craig-migliaccio-april-2022/ Craig on LinkedIn: https://www.linkedin.com/in/craig-migliaccio-71085a74/   This episode was recorded in January 2025.  

In this insightful episode of the Building HVAC Science Podcast, host Eric Kaiser takes a deep dive into the world of indoor air quality (IAQ) with guest expert John Ellis. With over four decades of experience in HVAC and building science, John shares his wisdom on addressing IAQ challenges effectively. The discussion spans the critical importance of tailoring solutions to individual client needs, the tools and methodologies for assessing indoor air environments, and the interplay between building science and mechanical systems in achieving optimal outcomes. John introduces his six key principles for good IAQ, covering everything from thermal comfort and filtration to pollutant control and building pressure management. The conversation also highlights real-world applications, including helping clients with severe medical conditions improve their quality of life through better IAQ strategies. Whether you're an HVAC technician or a building performance professional, this episode is packed with actionable insights and practical advice to elevate your IAQ solutions. John’s number 505-652-8119 LinkedIn: https://www.linkedin.com/in/john-ellis-b13b0411/ Facebook: https://www.facebook.com/john.ellis.3701 Dynamic Air Consulting on Facebook: https://www.facebook.com/DynamicAir4U HVAC Learning Campus: https://www.hvaclearningcampus.com     This episode was recorded in January 2025.

In this heartfelt episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn welcome Manly Arnason, an HVAC business owner from Brandon, Manitoba, Canada. Manly shares his journey of transformation—from a challenging past to becoming a dedicated tradesperson with a mission to bring integrity and quality to the HVAC industry. Drawing from his experiences running a small business, Manly opens up about the challenges of implementing proper practices in the trades, the importance of continuous education, and the role of community in fostering growth and excellence. Manly’s story highlights the power of personal and professional change, emphasizing his commitment to commissioning systems properly, adhering to codes, and treating customers with the respect they deserve. The conversation touches on the unique challenges of working in the Canadian climate, the significance of national apprenticeship programs, and the value of building a like-minded community to support others striving to improve their craft. This inspiring episode is a reminder that growth, both personal and professional, begins with a decision to do better. His business website: https://www.firstcallbrandon.ca/ His business on Facebook: https://www.facebook.com/firstcallbrandon Manly’s email: firstcall2255@gmail.com     This episode was recorded in January 2025.

In this engaging episode of the Building HVAC Science Podcast, hosts Eric Kaiser and Bill Spohn welcome Jason Esteves and Dan Kelly from Seitron Americas. The discussion offers an in-depth look at Seitron’s evolution, its role in the HVAC industry, and the company's dedication to training and customer support. Jason and Dan share their personal journeys, recounting how they started in the industry, their mentorship under the late Ray Biarnes, and their passion for delivering high-quality products and service. The conversation highlights Seitron’s live-fire training academy, the launch of new products like the BeSafe portable gas monitors and combustion analyzers, and their upcoming refrigeration tools debuting at AHR Expo. The guests emphasize the company's focus on customer feedback, innovation, and a family-oriented culture. Personal anecdotes, such as Jason’s son competing in the Little League World Series and their mutual connection to their soccer coach turned mentor, add a relatable and heartfelt dimension to the episode. This episode is a must-listen for HVAC professionals eager to learn more about Seitron’s commitment to supporting technicians, innovating in the field, and fostering a sense of community in the industry. Find Seitron at Booth 5391 at the AHR expo Seitron’s homepage: https://seitron.com/en_us/ Seitron Products at TruTech Tools: https://trutechtools.com/seitron-americas.html Jason’s contact info: https://www.linkedin.com/in/jason-esteves-9690255/ jesteves@seitronamericas.com Dan’s contact info: https://www.linkedin.com/in/dan-kelly-b387b873/ dkelly@seitronamericas.com   This episode was recorded in January 2025.

In this engaging episode of the Building HVAC Science Podcast, host Eric Kaiser is joined by Robert Bean, an ASHRAE Distinguished Lecturer and a renowned expert on indoor environmental quality (IEQ). Together, they explore the intricate relationship between architecture, thermal comfort, and HVAC systems. Robert shares insights from his extensive travels, observations of traditional architecture, and key lessons from his work in designing high-performance buildings. The discussion highlights the critical distinction between energy efficiency and human comfort, emphasizing that discomfort often drives energy use. Robert explains foundational concepts like mean radiant temperature (MRT) and operative temperature and how they profoundly affect perceived comfort. He challenges common industry assumptions, such as relying solely on air temperature for thermal comfort, and advocates for a comprehensive approach that includes radiant, convective, and architectural solutions. Listeners will gain practical advice on incorporating IEQ principles into design, leveraging tools like the ASHRAE Standard 55 and Robert’s free eBook, Thermal Comfort Principles and Practical Applications for Residential Buildings. The conversation concludes with a call to prioritize human comfort in every aspect of building design and operation. Get the free eBook mentioned here: https://www.linkedin.com/groups/13843486/  Here is Robert’s LinkedIn profile: https://www.linkedin.com/in/robertbeanret/ Center for Built Environments Thermal Comfort Tool: https://comfort.cbe.berkeley.edu/ Robert joined us in 2017 for episode #4: https://www.buildinghvacscience.com/ep4-it-takes-more-than-a-good-hvac-system-to-deliver-comfort/   This episode was recorded in January 2025.

In this episode of the Building HVAC Science Podcast, Eric Kaiser welcomes David Richardson from the National Comfort Institute. David shares his journey from starting as a “gopher” for his father’s HVAC business to becoming a leading advocate and instructor for high-performance HVAC systems. The discussion delves into the evolution of HVAC standards, focusing on the importance of measurements, diagnostics, and craftsmanship in delivering comfort, safety, and energy efficiency. David introduces the concept of high-performance HVAC, emphasizing the importance of field measurements to diagnose and solve system inefficiencies. The conversation highlights tools like the TrueFlow® Grid, which have revolutionized testing accuracy and streamlined processes. They also touch on customer engagement, the challenges of breaking industry habits, and the importance of a growth mindset when adopting new practices. The episode concludes with David encouraging HVAC professionals to embrace small, consistent improvements, measure system performance on their own projects, and engage with the growing community of like-minded industry peers who are eager to share knowledge.   Here is David’s LinkedIn profile: https://www.linkedin.com/in/david-richardson-41502112/ NCI’s HOMEPAGE: https://www.nationalcomfortinstitute.com/ NCI Store on TruTech website: https://trutechtools.com/nci-store.html Find the Digital TrueFlow® Grid at TruTechTools®: https://trutechtools.com/trueflow     This episode was recorded in January 2025.

In this insightful episode of Building HVAC Science, co-hosts Bill Spohn and Eric Kaiser reconnect with Silas Hoeppner for a follow-up discussion that dives deeper into optimizing comfort and efficiency in existing homes. Silas shares his journey of transitioning from a house-centric approach to an occupant-centric model in his work, detailing the lessons he’s learned and how these shifts have reshaped his philosophy. You can find more details on Silas’ backstory in Episode 193, found here: https://www.buildinghvacscience.com/ep193-building-performance-with-purpose-silas-hoeppners-journey-november-2024/ Silas explains the importance of understanding homeowners’ unique goals and success metrics rather than imposing a one-size-fits-all solution. Through his experiences, he emphasizes the value of asking the right questions, effectively addressing comfort issues, and avoiding assumptions about efficiency or customer priorities. Silas also explores the nuances of balancing technical precision with customer communication, highlighting real-life examples of problem-solving that reflect this paradigm shift. The conversation touches on common misconceptions, such as the oversizing of heat pumps and misplaced priorities in energy audits. Silas concludes by offering actionable advice for listeners: prioritize clear communication, understand the occupants’ real needs, and ensure solutions align with both immediate and long-term goals. Here is his LinkedIn profile: https://www.linkedin.com/in/silasjames/   This episode was recorded in December 2024.