Heat pumps keep working in freezing weather down to 10°F or lower and use far less energy than emergency heat. Let your heat pump handle its own defrost cycles instead of switching to emergency heat manually. Only use emergency heat if snow or ice physically blocks the outdoor unit.
The heat pump can still get heat out of there even though it's freezing outside, or 30 degrees, or 20 degrees, or 10 degrees. You can still get heat out of there, and heat pump heat is a lot more efficient for energy than that emergency heat. But if you have to use emergency heat, you have to use it, so don't switch over. Let it figure itself out. If the unit is covered in snow or ice or it's blocked, then emergency heat needs to be used. But if that unit can go through its cycles of defrosting, coming back on, defrosting, coming back on, that is much more efficient for your energy bill if you let it do that.
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