We’re getting air source heat pumps for our house in Michigan- including new tech that makes it still work to minus 20. However, due to the possibility of a pol

We’re getting air source heat pumps for our house in Michigan- including new tech that makes it still work to minus 20. However, due to the possibility of a polar vortex, and the decreasing efficiency below zero, the installer recommended a small backup furnace for the lower floor (the full electric backup option was electric heat coils, but that’s super inefficient). It will be interesting to see how often we choose to use that in practice. The installer estimates I won’t save any money on energy bills during the heating season (like we would with ground source), but should be comperable. I also like that when we eventually get solar, we’ll be able to power our entire house (also getting induction stove).