Bryan Orr

Bryan Orr is an HVAC and electrical contractor in Orlando, Florida. He is the founder of HVACRSchool.com and the HVAC School Podcast. He has been involved in technician training for 15 years.

The Impact of Adding or Removing Water from Air

Understand the effects of temperature and humidity changes

Bryan Orr

March 16, 2020

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We often humidify and dehumidify as part of our work, but let’s take a different look at what happens when we do that.

Understanding HVACR Brazing Indicators

How to ensure connections are done correctly

Bryan Orr

March 2, 2020

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In brazing and soldering tubing, we have a few things we need to accomplish to make a proper connection.

The Five Pillars Of Residential A/C Refrigerant Circuit Diagnosis

Take all of these into account on each service call

Bryan Orr

February 17, 2020

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Suction pressure, head pressure, subcooling, superheat, Delta T: Taking all five of these calculations into account is critical.

Understanding the Use of Suction Filters/Driers

They can help protect compressors when used right

Bryan Orr

February 3, 2020

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Unfortunately, we can easily forget the role that suction driers can play in protecting the compressor and the compressor oil.

Why Air Conditioning Systems Freeze and How to Fix Them

Understanding the basics will help your service team

Bryan Orr

January 20, 2020

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Some systems we work on and install will freeze. Air conditioning is not one of them.

How to Diagnose a Thermostatic Expansion Valve Failure

Tips for understanding the role of the TXV, and how to service it

Bryan Orr

January 6, 2020

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This article will hopefully save the lives of a few TXVs and the pocketbooks of some customers.

A Guide to Air Barriers, Vapor Barriers, and Insulation

Understanding these basics will help with building issues

Bryan Orr

November 25, 2019

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Trying to fix building problems with equipment can be a problem. Here are some basics to help you diagnose and solve building issues.

The Basics of 20 mA Control

Understanding electrical controls

Bryan Orr

October 28, 2019

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Controls have gone from mechanical to electrical, so we have systems that are controlled by analog electrical signals and digital electrical systems.

Four Mistakes for Beginning HVAC Techs to Avoid

Tips to stand out for successful work

Bryan Orr

September 30, 2019

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There are some very preventable mistakes that occur due to simple oversight and carelessness. A few practices will avoid them.

An Introduction to Glide at Static Pressure

Bryan Orr

September 16, 2019

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We’ve been spoiled in the USA because we haven’t needed to deal with glide much. But the days of being able to ignore glide are coming to an end.

Did you know that high GWP refrigerants will be phased down in the U.S.? This webinar will focus on one of the leading HFC alternatives, R-454B (Opteon™ XL41), which is replacing R-410A in HVAC applications.