You can do two things, if so inclined: I’m in the midst of having a heat pump system installed in line with my existing gas furnace, the so-called “dual fuel” a

You can do two things, if so inclined: I’m in the midst of having a heat pump system installed in line with my existing gas furnace, the so-called “dual fuel” approach. The heat pump should suffice for most cool days, with the furnace available for when it’s truly cold. (Colorado front range; we don’t get the same winters that we used to.)