Tickets On Sale For The 8th Annual HVACR Training Symposium!


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Don’t miss HVACR’s main event—AHR Expo Chicago!

Explore the latest product innovations, industry trends, and best practices shaping the year ahead. Connect with leading manufacturers and discover solutions designed to solve workplace challenges and support your professional growth. Registration is free and includes access to everything HVACR—products, professionals, perspectives, and more.

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Bryan Orr

BRYAN ORR

Co-Founder and President at Kalos Services, Bryan has been involved in HVAC training for over 13 years. Bryan started HVAC School to be free training HVAC/R across many mediums, For Techs, By Techs.


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Flowing nitrogen while brazing does not mean the air was cleared first. Learn how to purge large ACR piping, choose a practical regulator setup, and estimate time and cylinder use.
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What is a GFI?
First off, the correct acronym for a GFI (ground fault interrupter) is “GFCI” (ground fault circuit interrupter). The purpose is to act as a safety device to protect from electrical shock. GFCIs are important components of electrical safety; they even make an appearance in our electrical safety video. GFCIs can be built into outlets, circuit […]
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Laws of Energy and Matter
It’s always good to reaffirm some of the basics of energy, work, and matter. The five rules below are some of the most basic and important. The First Law of Thermodynamics States that energy cannot be created or destroyed. It can only change forms or be transferred from one object to another. If you’d like […]
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