Please turn JavaScript on
HVAC School icon

HVAC School

Click on the "Follow" button below and you'll get the latest news from HVAC School via email, mobile or you can read them on your personal news page on this site.

You can unsubscribe anytime you want easily.

You can also choose the topics or keywords that you're interested in, so you receive only what you want.

HVAC School title: HVAC and Refrigeration Free Training

Is this your feed? Claim it!

Publisher:  Unclaimed!
Message frequency:  0.28 / day

Message History

When I was a green tech, I was really big into showing up all the other techs by doing THE BEST cleaning I possibly could. One of my favorite things to do was to clean the condenser until it was SPOTLESS inside and out. The only issue was that I really liked using that brown coil cleaner—which will remain nameless—in pretty intense concentrations. (It was so ...


Read full story

Does setting a thermostat too low cause an air conditioning system set in cool mode to freeze?

The answer is no, at least not directly.

However, low evaporator load (low return temperature or low airflow) and low outdoor ambient temperature can lead to evaporator coil freezing. Low indoor setpoint can lead to low return air ...


Read full story

When a system has abnormally high head pressure (high condensing temperature over ambient) and compression ratio, one of the easiest things to look for is a dirty condenser coil. More often than not, that will be the cause.

However…

There is another category of issues that can cause high condensing temperature (high head pressure), but these...


Read full story

I wanted to share a recent “rediscovery” with you out of pure humility. I call it a rediscovery because it’s a basic fundamental I already knew, but it just hadn't come up recently enough to be top of mind until the other day.

I found myself troubleshooting a single-pole Mars 91311 contactor. I had voltage on the line side, but nothing on the load side. The wires we...


Read full story

My family tries to live as holistically as possible. We make a lot of our own food and stay away from things that are heavily processed and have a lot of additives, preservatives, and common allergens. That means we like to buy snacks from independent brands that are transparent about their recipes, and one of our favorites in recent years was Siete chips, tortillas, and taco...


Read full story