I am saying the heat pump struggles to keep up with the temp on the thermostat. It runs constantly and cannot maintain the ~70 we have the thermostat set too.

I will say, it is unseasonably cold the last few days (40’s) and my house is comfortably warm. But I cannot imagine going days sub freezing and the heat pump keeping up. But I am a spoiled American.

Yes to both.

I live in NC where a very cold day is +20F and I have to say I do not feel my heat pump keeps my house very warm. Maybe l just have a very high expectation of what a warm house feels like, but based purely on comfort I would not pick a heat pump. My house is only about 7 years old, so maybe the technology has improved since then?