It’s never a waste of time to review TEVs — their operating principles, installation, maintenance, and troubleshooting.

What happens if a system doesn't have a defrost/termination/fan delay control?

Claiming to have 265 "defective" boilers is bound to raise suspicions.

Devices used to measure subcooling, evaporator superheat, and total superheat save time, money and aggravation.

Ace troubleshooters utilize service checklists as well as critical analysis to determine problems.

There are four main components of the refrigeration cycle. Do you know what they are and how a metering device works with those components?

Reversing valves can be difficult to remove because they have four solder joints to deal with at the same time and, to make matters worse, they are very heat sensitive.

Charging air conditioning systems is much different than charging refrigeration systems.

The method used to prove flame in most gas-fired products produced in the last seven or eight years is often misunderstood.

The key is to size, select, and install them correctly.