AUX heat refers to your heat pump’s “backup” electric resistance heating. This heat setting should only kick on when the heat pump can’t produce enough heat to warm your home or if your heat pump goes into defrost mode.
We know you have questions, so below we’ll go into more detail about:
How your heat pump works (AUX heat vs. “normal” heat) When it’s okay for your heat pump’s AUX heat to be on What do do if your AUX heat is on and shouldn’t be