Air Source Heat Pump is starting to win more and more builds. We get -20 C (-4 F) on a regular basis in winter, with some occurrences of -30 C (-22 F) and sometimes -35 C (-31 F). A friend who lives out of town got rid of his propane furnace and hot water tank, and his propane stove & oven. He got a cold-rated (-40 C/F) Mitsubishi ASHP central heating/cooling (so he doesn't have to get & run separate fresh air circulation) with an aux heater. And a Heap Pump Water Tank. He's never used the aux heater (breaker off), even with it going to -35 C his first winter. They'd had a window A/C unit that saw occasional use in the summer. With the ASHP, it's quieter than any A/C he's ever seen (it's crazy quiet), and his wife and three teens were running it all the time. He also got a Bolt to replace his gas powered car, and a 240 V charger for it in his garage. With all those things switched over from propane to electricity, their usual usage, A/C all the time and adding charging the car, his monthly electric bill was still less than his monthly gas expense used to be for driving the ICE car to/from work five days a week.
I've almost got him convinced to add an air duct running from his bathroom back to the air intake on the HPWT, so when the bathroom gets heated with hot water use, more of that heat will get reclaimed by the HPWT instead of throwing it away outdoors by venting the bathroom (HPWT outputs cooled dry air and a drain line for the condensate).
He installed PV panels this spring, and his first electric bill was $20 and through the summer he's not paid but earned $30 to $40 a month, with all that electricity use. He has fixed panels facing east, south & west. He's very curious to see what his bill is through the winter with the reduced PV output.
