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Heat pumps work until about 25F.
Any colder and aux heat is needed; gas or elect back up.
Cold climate heat pumps are here and we are currently testing several down to -20F.
Not sure when they will hit the stores.
Frozen coils usually mean low refrigerant or low airflow.
Step one is change your filter and clean the coil.
If that doesn't work then get a tech to check pressures and troubleshoot.
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“The wave is not the water. The water merely told us about the wave moving by” – Buckminster Fuller
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