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A commonly taught method for measuring airflow is the temperature rise method, where you use a heat source that produces a set number of BTU/h, such as heat strips. Then, using the sensible heat air equation, you can “easily” calculate the CFM being produced by the equipment. Let's use this specific example to illustrate the […]

Heat Exchangers and Temperature Rise – Short #227

In this short podcast episode, Bryan talks about heat exchangers and temperature rise in gas furnaces, especially 80% open-combustion gas furnaces. Temperature rise is the difference between the return air temperature and supply air temperature; in cooling, we usually refer to this difference as a delta T or temperature split. The manufacturer sets a […]

rjoyner@pstallahassee.com
#airflow #sensible air #temperature rise

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HVAC School – For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this episode, Bryan Orr sits down with Ty Branaman for a wide-ranging conversation about what it really takes to be a good on-call technician. They open by reminiscing about how dispatch technology has evolved over their careers — from pagers, radio codes, and outdated paper map books to MapQuest, early GPS units, and today’s 24-hour dispatch systems. That trip down memory lane sets up the episode’s central theme: while the tools have changed, the mindset needed to succeed on call has not. Both hosts agree that being on call can be genuinely enjoyable when a technician learns to embrace the autonomy, the bigger paychecks, and the quieter, less stressful roads that come with nights and weekends.

A major thread running through the discussion is self-discipline and long-term thinking. Bryan and Ty encourage younger techs to treat on-call money as an opportunity rather than spending cash — saving and investing overtime pay instead of financing trucks, boats, or other lifestyle upgrades. They share stories about the financial traps of seasonal trade work, the value of staying in a consistent routine even at 2 a.m., and how cutting corners under fatigue is often what leads to injuries or callbacks. Ty compares a disciplined on-call tech to a pilot running through a pre-flight checklist: the process matters just as much in the middle of the night as it does at noon.

The conversation also digs into customer relationships and judgment calls in the field. They talk candidly about the difference between genuine emergencies and entitled or overblown complaints, and how companies that over-market “24/7 service” can create unrealistic customer expectations. Bryan shares a story about temporarily misting a struggling condenser to get an elderly client through a brutal heat wave, using it to illustrate the kind of judgment-based, get-them-by fix that defines old-school on-call work — as opposed to always pushing for a full sale. Safety boundaries, cutting corners responsibly, and the excitement of solving unpredictable problems on the fly are all discussed as part of what makes the work rewarding despite its challenges.

Finally, Bryan and Ty turn to advice for company owners and service managers. They emphasize building fair, well-communicated on-call rotations, respecting technicians’ personal time, and charging appropriately for after-hours work so that both customers and technicians value it. Ty argues that the industry needs to reframe HVAC work as a skilled trade rather than commodity labor, and that companies should be careful not to chase more emergency calls than their technician pool can sustainably handle. The episode closes with reflections on career growth, mentorship, and the kindness that comes from helping teammates cover on-call shifts for one another.

Topics Covered

The evolution of dispatch: pagers, radio 10-codes, paper map books, and early GPS
Why on-call work can be enjoyable: autonomy, higher pay, and quieter roads
The hardest part of on-call: getting called back out after coming home
Customer expectations, entitlement, and the impact of “24/7 service” marketing
Saving and investing on-call earnings instead of overspending on trucks and boats
Staying in routine and following checklists even late at night to avoid callbacks
Sleep, hydration, and avoiding excess caffeine while working on-call shifts
Judgment calls and temporary fixes to get customers through emergencies safely
Knowing your personal safety and ethical limits when cutting corners
Career paths with less on-call demand: maintenance roles, installation, stationary engineering
Reframing HVAC service as a skilled trade rather than commodity labor
Building fair, well-communicated on-call rotations to prevent technician burnout
Mentorship, teamwork, and covering shifts for coworkers with families

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Tips for Being On Call w/ Ty

08/20/2026

Bryan Orr

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