I'd you combine a heat pump with solar it makes even more sense. I've been building a house in Northern Europe (-25C / -15F in winter) and in 2019 calculated ho

I'd you combine a heat pump with solar it makes even more sense. I've been building a house in Northern Europe (-25C / -15F in winter) and in 2019 calculated how much it would be to heat with a) natural gas, b) air source heat pump or c) air source heat pump and solar PV. The (b) heat pump option is more expensive up front, but over the course of 10 years (minimum expected life of the heat pump) worked out the same as (a) natural gas, and has the added benefit of being able to cool the house in the summer. Once you take into account solar (which was calculated to pay itself off after 6 years) it makes no financial sense to choose natural gas. I made these calculations in 2019 and used a rather optimistic 2.5% inflation rate for energy prices, so if you do that again today it's even more in favour of the heat pump and solar. (I am aware that there are gas absorption heat pumps, but there are very few manufacturers right now, and the ones I found available here were 2-3x the price of an electric unit)