HVAC School - For Techs, By Techs

In this episode, Bryan sits down with Leilani for an introduction to GRIT Camps — the hands-on program that brings skilled trades exposure to youth ages 12–17 through community events led by working tradespeople. Leilani explains that a GRIT Camp pairs recruited mentors with students for a day of modules covering safety, carpentry, electrical, brazing, and plumbing, including torch work, PVC and copper fitting, and disassembling HVAC components. Students also learn to read a jobsite-style blueprint and receive a six-in-one screwdriver to take apart and explore. Bryan and Leilani emphasize that while GRIT supplies the curriculum, guides, and structure, the host — typically a contracting business or trade organization — owns the event: recruiting students and mentors, securing a venue, and building real community connections around the day.
A large portion of the conversation walks through who does what. Hosts provide the facility, materials (plywood, 2x4s, copper, PVC, and more, all detailed in GRIT's guide), and lunch for up to around 30 people, plus a local host facilitator to coordinate logistics and serve as GRIT's point of contact. Mentors must be certified skilled tradespeople who complete GRIT's required video course and pass a background check before working with students; volunteers who don't interact directly with kids are not required to undergo a background check. GRIT, in turn, supplies the camp curriculum, host and mentor guides, registration and marketing materials, badges, student blueprints and PPE, background check coordination, and on-site program leadership from staff like Ty, GRIT's head of training, who typically arrives the day before to walk the facility with the host.
Bryan and Leilani also dig into planning specifics: camps run from about 9:30 a.m. to 3:30 p.m., cap out at 16 students with a two-students-per-mentor ratio (so eight to nine mentors for a full camp), and generally need 10 to 12 weeks of lead time to hit deadlines for mentor certification, materials gathering, and student registration. They cover the realities of choosing a torch and joining system — MAPP gas and propane versus oxyacetylene for brazing, and why oxyacetylene can't be used for the popular aluminum-repair activity — along with commonly overlooked items like correctly sized Forstner bits, spare drill batteries, extension cords, and pre-cut lumber. They close with guidance on budgeting (camps typically run $1,500 to $5,000), sourcing a sponsored lunch, handling allergies, inviting community press, and what makes a camp genuinely successful: preparedness paired with passion from both mentors and hosts.
Topics Covered
What a GRIT Camp is and which skilled trades are covered (safety, carpentry, electrical, brazing, plumbing)
Camp roles: host, host facilitator, mentor, students, and volunteers
What hosts are responsible for providing: facility, materials, and lunch
What GRIT provides: curriculum, guides, registration, marketing, background checks, and on-site leadership
Required mentor certification course and background checks
Ideal space setup, table stations, and indoor/outdoor considerations
Student and mentor ratios (16 students max, two students per mentor)
Planning timeline: 10–12 weeks of lead time and key deadlines
Confirming a camp date and the host interest assessment process
Recruiting students and mentors, including waitlists and communication
Choosing a torch and joining system: MAPP gas/propane vs. oxyacetylene brazing
Commonly overlooked or underestimated materials and tools
Safety planning, PPE, and emergency preparedness
Estimated costs and ways to offset them through sponsorships
Lunch planning and handling food allergies
Community and marketing value for hosts
Policies on parents and visitors attending
What makes a GRIT Camp successful
 
Learn more about the GRIT Foundation or contact us at https://www.thegritfoundation.com/. 
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 8th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.
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In this short episode, Bryan and Roman talk about the psychrometrics of a hidden moisture failure... behind the drywall. Roman had an indoor air quality and mold assessment in his own home, and he learned that there were active mold spores in his home; he shares what he learned from the experience.
Roman had a bulk water issue from plumbing (though bulk water issues can also occur outside the building or from condensate drainage problems). Walls are NOT solid; they have plumbing and insulation inside, and the air spaces between the walls support a microclimate when moisture is in there, regardless of whether it's water vapor or bulk water. In Roman's case, the bulk water failure came from the plumbing leak; it saturated the slab for half the house. The water was absorbed by the concrete, and any surface that touched the concrete transferred that water over time. 
The mold assessor used two different devices. The pin-type meter punctured the surface of wood or drywall and measured the resistance between the probes (water transfers electrons between them); the measurement revealed the water quantity. A pinless meter determined the source of the failure via high-frequency radio waves, and it measured the capacitance to determine whether moisture was present within or behind the surfaces. The results showed that water was behind tile, baseboards, and drywall.
Thermal imaging has also proven to be a useful tool to see the cooling effect that occurs when water evaporates from liquid to vapor inside a wall, but the cold spots go away when the space thermally equalizes. While HVAC professionals cannot assess mold, we can use tools like thermal imaging to help determine when it's time for a customer to call someone who can help; we are still responsible for our customers' health and comfort in their homes.
 
Learn more about building science concepts, especially moisture and its effects on buildings and comfort, from the Building Science Corporation's many great resources at https://www.buildingscience.com/. 
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 8th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.
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Join Roman Baugh, Craig Migliaccio (AC Service Tech), and Jim Fultz for an unfiltered conversation about training mistakes, teaching pitfalls, and educational failures in the HVAC industry.
Recorded live at the 7th Annual HVAC/R Training Symposium, this candid discussion reveals what experienced educators wish they knew when they started. Learn from their mistakes so you don't have to make the same ones!
Topics Covered:
The biggest mistake: talking instead of hands-on learning
Why attention spans matter (hint: it's not 50 minutes!)
How to read your audience and adapt your teaching style
The power of letting students struggle and problem-solve
Avoiding "death by PowerPoint" in HVAC training
Making education engaging for the TikTok generation
Why sequence of operation matters more than troubleshooting
The importance of mentorship and accepting feedback
The HVAC/R Training Symposium session is perfect for:
HVAC instructors looking to improve their teaching methods
Trade school educators seeking better student engagement 
Technicians who train apprentices
Anyone interested in effective HVAC education strategies
What NOT To Do in HVAC Training:
Don't lecture for hours without breaks
Don't focus only on PowerPoint presentations
Don't ignore different learning styles
Don't forget hands-on, kinesthetic learning
Don't try to cover everything in one session
Don't be afraid to admit mistakes and learn from feedback
 
Check out Craig's books and training at https://www.acservicetech.com/. Connect with Jim on LinkedIn.
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 8th 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 short podcast episode, Bryan answers a question from Evan about the true cost of uninsulated refrigerant lines, especially in terms of efficiency losses and decreased longevity.
Insulation keeps refrigerant cold, usually in the suction line; it makes it harder for cool vapor refrigerant to absorb heat. (Expansion lines are also insulated.) When that refrigerant picks up heat, that heat has to be rejected again, and it makes the compressor run hotter, which can lead to premature failure. If an uninsulated or poorly insulated suction line is in an attic or crawl space, condensation may also form and cause damage, as the surface is below the dew point.
When suction vapor gets warmer, the discharge temperature, discharge pressure, and compression ratio all increase. The lower the compression ratio, the more capacity per watt; more BTUs move per watt input. The density of the suction vapor also decreases, and lower densities lead to lower compressor mass flow rates; that is where the efficiency losses occur. 
Compressors are also cooled by suction gas, and when there is warmer suction gas, the cooling is less effective. The compressor will run hotter over the course of its life, which makes the oil less viscous and can lead to eventual oil breakdown. Technicians may also read a higher superheat on an uninsulated suction line and mistakenly add more charge to fix a classic symptom of undercharge. They may also misdiagnose a valve failure and perform an unneeded replacement. 
Uninsulated suction lines are also code violations that will get written up on inspection reports, so we should address them as we see them and give the client a chance to accept or decline the insulation.
 
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 8th 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 live-stream episode, Bryan is joined by Tim DeStasio, John Semmelhack, and Ty Branaman for a deep dive into residential ventilation — the often-overlooked "V" in HVAC. The group opens with quick life updates before launching into a wide-ranging conversation covering the three core ventilation strategies (circulation, extraction, and dilution), how tight home construction changes the ventilation equation, and why there is no single "magic number" that works for every house.
A major theme is the physics of pressurization and depressurization. Tim walks through balanced strategies (ERVs and HRVs), positive-pressure approaches using ventilating dehumidifiers, and exhaust-only setups — explaining why exhaust-only, while still code-compliant, is his least favorite option due to the risk of pulling air from crawl spaces, attics, or combustion appliances. Using REDCalc, Tim demonstrates how even modest airflow can swing a tight house's pressure by ten or more pascals, and the group discusses how wind, stack effect, and seasonal conditions constantly change a home's natural air exchange rate.
Ty brings a service-focused perspective, emphasizing measurement before intervention — checking CO2, carbon monoxide, and other indicators before jumping to solutions like bigger fans or added dehumidification. He shares real-world stories, including a rental home with elevated CO from an unvented gas range, and stresses that building science problems (duct leakage, poorly placed bath fans, depressurized combustion appliances) often hide behind symptoms that look like simple ventilation shortfalls. Large kitchen range hoods get particular attention: hoods moving 1,200 CFM or more can seriously depressurize a house, and the group discusses code thresholds for interlocked and powered makeup air, along with practical products like the Fantech MUAS.
John rounds out the discussion with a walkthrough of a real high-performance home design, showing how an ERV can serve both whole-house outside air and continuous bathroom exhaust, how MERV 16 pre-filtration has become a common upgrade since the 2021—2022 wildfire smoke events, and how an ERV can be configured to boost into a makeup-air role when a range hood kicks on. The episode closes with a look at ventilating dehumidifiers, demand-controlled ventilation, the tradeoffs of leaving blower fans in the "on" position, and recommended resources for anyone wanting to go deeper into building science.
Topics Covered
The three ventilation strategies: circulation, extraction, and dilution
How tight, high-performance construction drives the need for mechanical ventilation
Calculating and understanding natural air exchange rates
Balanced (ERV/HRV), positive-pressure, and exhaust-only ventilation strategies
Using REDCalc to model pressurization and depressurization
Why exhaust-only ventilation can create combustion safety risks
Designing ventilation with flexibility beyond code-minimum rates
Measuring first: CO2, CO, and pollutant levels before choosing a solution
Large range hoods, makeup air requirements, and the Fantech MUAS system
Passive capture and range hood geometry (corner hoods vs. center islands)
A real-world high-performance home ERV design walkthrough
MERV 16 pre-filtration for outside air following regional wildfire smoke events
Using an ERV in a makeup-air configuration for range hood operation
Ventilating dehumidifier strategy and sizing considerations
Demand-controlled ventilation and the new ASHRAE 62.2-2025 guidance
Risks of leaving blower fans in the "on" position, including duct leakage effects
Recommended building science resources: Joseph Lstiburek, Allison Bailes, and TEC classes
 
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 8th 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.