Relative gas/electric pricing may be a lot different where you are. In the Seattle area gas is around $1.20 per therm which works out to about 24 kWh of heat pe

Relative gas/electric pricing may be a lot different where you are. In the Seattle area gas is around $1.20 per therm which works out to about 24 kWh of heat per dollar. Electricity is around $0.11 per kWh or 27 kWh heat per dollar assuming 300% efficiency for the heat pump, so slightly better here. Of course if you want air conditioning that comes for free as part of the heat pump, and if you add solar that offsets the operating cost. Probably someone somewhere as built a calculator that shows where on the map the tradeoff goes one way or another.