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The ac unit compressor will run when it is in defroster mode and heat setting is on.

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15y ago

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Why does your air conditioner or heat squeal when you turn them on The air and the heat are both working but there is an awful noise?

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The AC and heater might run at the same time if the thermostat setting triggers both systems to maintain a specific temperature. For example, in heat pump systems, the heat pump may run in cold weather to provide supplemental heat to the home while the AC unit is also activated to cool the air that is released into the home.


Can you have two thermostats for one AC unit?

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