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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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I’ve Done It This Way for 20 Years – And That’s the Problem

Every trade has its favorite phrases. One of the most common in HVAC goes something like: “I’ve been doing it this way for 20 years and never had a problem.” When you hear that—or when you catch yourself saying it—it’s worth stopping to think. Usually, what that sentence really means is: “I’ve been doing it […]

32°F Saturation (Evap Temperature)

Evaporator temperatures below 32°F (or 0°C) are common and acceptable in refrigeration; that's why there is a defrost sequence. It's the same story for a heat pump running in heat mode; freezing is a part of the process, and defrost is necessary. In comfort cooling, we can't allow the evaporator to get below 32°F, or […]

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 […]

10 Things I’ve Learned in the Last 10 Years

Humility in Thought Leadership

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Symposium Day 1 Introduction

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Universal ECM Motor & AmRad Capacitor Training for HVAC Techs

Fast-Stat 1000 Unboxing

Digital TrueFlow® Grid Forecasting in 3D

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Making Stuff Real – Short #254

In this short podcast episode about a bigger-picture topic, Bryan talks about making stuff real. He talks about how to make ideas, businesses, podcasts, and other large projects come to life based on his experiences with HVAC School, Kalos, and several other current and past projects. Understanding yourself and the thing you want to […]

Is HVAC School Worth It?

In this comprehensive discussion, Bryan sits down with Brad Cooper, an experienced HVAC instructor from Arkansas, and JD Kelly, a trade school graduate, to tackle one of the most pressing questions in the HVAC industry: Is trade school worth it? Rather than offering a simple yes or no answer, the trio dives deep into […]

Split-Phase vs. 3-Phase – Short #253

In this short podcast episode, Bryan breaks down the differences between split-phase and 3-phase power in HVAC systems. Split-phase is a form of single-phase power, and it's common in residential HVAC. Three-phase power is more common in commercial and industrial applications. Single-phase power uses only one of the three phases of power produced by the […]

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 […]

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 […]

Basic Electrical Circuits

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