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@panduck @kevinrns @Barbramon1 @jeber

A heat pump transfers heat into or out of your home from the outdoor compressor via a refrigerant, where an indoor fan unit either cools or heats the air by blowing it over a coil of the refrigerant. It can either heat or cool your home.

An air conditioner cools hot outside air then blows it into your house. So, rather than continually cooling the increasingly cool inside air, it always has to cool the hot outside air. Less efficient than a heat pump.