this post was submitted on 12 Sep 2023
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Theres different technology but there are some that can function to -32° F and they often have a feature that allows them to detect when theyre frozen up and defrost and then automatically switch back to heating
Mine has a defrost cycle but it doesn't work very well. But then again, it's use case is primarily AC - it only gets frigid temps in my area every couple years. EDIT: yes, downvote me for stating my own personal experience, asshats.
Honestly it sounds like your unit may need to be serviced.
A lot of people also don't understand that a heat pump is still heating your home, even though the air it blows might be a bit lower than your body temperature, so it feels "cool." When that happens people assume it has stopped working and switch to aux heat. This is one of the major reasons people insist that heat pumps don't work in the cold, even though they still have plenty of capacity margin to heat the dwelling.
My old system was actually set up so that it would pulse the electric aux heater every few minutes or so to help prevent this "drafty" feeling, and to extend the time between defrost cycles.