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The place to learn some things you've forgotten
along the way, as well as remind you,
of some things you forgot to know in the first place.


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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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Lockout/Tagout Basics
DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source.   Locking out and tagging equipment is one of the most basic safety procedures in general industry and maintenance work, especially […]
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Prevent Refrigerant Migration
Refrigerant migration is a natural process that occurs during the off-cycle. The refrigerants have an affinity for oil and seek out the lowest-pressure areas, so it only makes sense that some refrigerant would be drawn to the compressor crankcase and may condense there. When the refrigerants condense, they saturate the oil. As a result, refrigerant […]
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Zonal Pressure Diagnostics—The Backtalk Series (Pt. 1)
This article was submitted by Genry Garcia of Comfort Dynamics, Inc. It is the first part of his series on zonal pressure diagnostics. Thanks, Genry!   Zonal pressure diagnostics have been around for a while. Here is a brief description of ZPD from the website redcalc.com:  Formerly known as the “Blasnik methods” in a nod […]
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