What is Air Handler?
The air handler is the indoor half of a split system: a cabinet containing the blower, the evaporator coil, and the filter rack that circulates conditioned air through your ducts. In homes with heat pumps, it often includes backup electric heat strips.
Why it matters in Arizona
Arizona air handlers frequently live in garages, attics, or closets — hot, dusty locations that make cabinet sealing and filter discipline matter more than in milder climates. A leaky air-handler cabinet in a 140° attic pulls superheated air straight into your airstream.
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