It's always in the middle of a heatwave. Your AC hums to life, but instead of the icy rush you're craving, it pushes out a faint, lukewarm breeze. That's when the dread sets in. Is the unit failing?

Lee Wallender is a home improvement writer of nearly 20 years and specializes in home remodeling, repair and maintenance. Cassidy was an updates editor whose main responsibility is to write and edit ...

There’s an old way of doing things in HVAC. It doesn’t matter if we’re talking about equipment, service, installation, or marketing practices. Anyone who’s been in the industry for long enough has ...