I think it's better to allow the heatpump to run continuously and use a good t-stat to cycle the aux based on the indoor temp.
The better stats don't work based on a fixed differential.
...when the cop drops below 2 it's probably not worth while.
i agree that hp is better than elec heat but there is a time when running the hp its a waste of powe
I've discovered a natural law - everything gets progressively worse. Things only break down and become depleted. Life isn't worth living and everything is going to hell.
Death is the messiah. Everything else is irrelevant and arbitrary.