Articles by ACCA (Air Conditioning Contractors of America)

A magnet, a thermometer, and the right pressure readings can tell you everything about a failing reversing valve. 

Venting rules change with efficiency — and mixing them up can lead to moisture buildup, heat exchanger damage, and dangerous combustion issues. 

A reversing valve can fail 3 ways: stuck in position, defective/displaced, or internal leak. 

If defrost isn’t working, something in the chain is broken. This step-by-step approach shows you exactly where to look and what to test.

Rushed furnace installations routinely crack heat exchangers, clog gas valves, and create CO risks long before the first heating season is over.

Delayed payments, paused approvals, slowed processing — contractors’ quick guide to navigating the shutdown.