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Bryan Orr
Company name: Kalos Services
Position: President
Bryan is the founder of HVAC School. Established in 2016, HVAC School produces free educational podcasts, videos, and tech tips for HVAC and refrigeration professionals.
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Switch Terms
A while back, I had a tech who was having some trouble finding a 35 PSI (2.41 bar) make-on-fall pressure switch. One adjustable switch in the catalog said (SPDT), but he didn't quite understand what that meant. In that case, it means single-pole, double-throw, and the “double-throw” part means that the switch has terminals in both the […]
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Piston Design and Bypass
I remember it like it was yesterday. It was my first day of work as a trainee at my first technician job, just a wet-behind-the-ears kid fresh out of trade school. It was a Monday morning, and the technicians and I were standing in the dusty warehouse surrounded by stacks and stacks of brand new […]
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5 Capacitor Facts You Should Know
One of the most common parts to fail on a single-phase HVAC system is the run capacitor, so much so that we sometimes refer to junior techs as “capacitor changers.” While capacitors may be easy to diagnose and replace, here are some things many techs may not know: Capacitors Don't “Boost” the Voltage  A capacitor […]
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Humility in Thought Leadership
NOTE: If you cannot view the recording, the video may still be processing. The maximum wait time is 24 hours. We apologize for the delay and appreciate your patience.
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IAQ, Ethical Selling & Building Better Techs w/ Brynn Cooksey
 In this episode of the HVAC School podcast, Bryan welcomes back Brynn Cooksey from Air Doctors and HVAC U to discuss critical topics facing the HVAC industry today. Brynn brings his unique perspective as both a successful contractor in southeast Michigan and an industry educator who has made the transition to focusing primarily on […]
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Crankcase Heaters – Short #248
 In this short podcast episode, Bryan talks about crankcase heaters, including their different types, what they do, and when we need to use them. Crankcase heaters usually come in belly band varieties, but some can be inserted into the sump of the compressor. As their name suggests, crankcase heaters heat the crankcase when the […]
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The Contactor Reimagined w/ Copeland
 In this episode of the HVAC School podcast, Bryan welcomes back Jim to discuss the groundbreaking SureSwitch contactor technology from Copeland. This isn't just another incremental improvement – it's a complete reimagining of how contactors should work in modern HVAC systems. Jim brings his expertise and even demonstrates the technology with a special cutaway […]
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Posts Commented

The Strange Behavior of Moisture in Stuff
Water is weird and water vapor is even weirder – before we dive down this rabbit hole lets define some terms To better understand the behavior of moisture in materials, we need to first define some essential terms and concepts: Relative Humidity (RH): The ratio of the amount of water vapor in the air to […]
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8 Tips for New Techs (So You Don’t Get Fired)
If you are new to the trade, I'd like to welcome you. Like many skilled trades, the HVAC/R trade has many opportunities and can help you make a good living. If you are young and new to the trade, we need you. We are grateful to have you. However, if you aren't thoughtful, you might […]
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