I installed three mini split heat pump units in our house so far that we have been remodeling for a few years built in 1950, we have a electric furnace that is ducted through part of the house that we don't use.

I'm a firm believer in the mini split units, you have zone control and they are inverter driven.....they ramp up and down when needed. Very cost efficient and good down to single digits, after that turn on your other furnace or grab another blanket.