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We have one heat pump and use it all the time when the temps allow. They do cut out at or near freezing. The furnace takes over then. Saves a ton of propane. They will not work after a determined outside temp, so when that happens, they don't assist the furnace.
There is NO heat strip. They work by reversing the operation of the AC providing heat. They have to cycle in rev for a bit of time before they provide heat, usually about 5 min then after that they come on and off as needed providing heat right away, as long as they haven't been off for a long time.
Get them if you can!
Bill
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