my heat pump makes loud noise in emergency heat mode

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Overall, a somewhat noisy heat pump is just the reality ofthe system. However, it should really only be loud during defrost mode, or ifyou have a reciprocating compressor instead of a scroll compressor. But there are other culprits that could cause a noisy heatpump too: a malfunctioning reversing valve, not enough refrigerant, or a badmotor.

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