3.6x, given 50% efficient generation and transmission, would require a heat pump COP about 7.2. Unfortunately real heat pump COPs are 3 or less, meaning the gas

3.6x, given 50% efficient generation and transmission, would require a heat pump COP about 7.2. Unfortunately real heat pump COPs are 3 or less, meaning the gas goes 1.5x further or less. This is still great (since it saves gas and there are other sources of electric) but unfortunately it's really high monetary cost (since the electric costs about 3x the gas, so even if the heat pump were free, it costs twice as much to run; electric prices follow gas prices closely so they don't get cheaper when gas runs short). So it's a hard sell. I think they're clever devices, I like them, I will probably buy one. But they're no panacea.