Checked out ground source heat pumps in the far north ?
No - hubby did consider putting in a heat pump when we built this house in 1976, but didn’t. We also considered retro fitting an outdoor wood furnace, but the cost was not within our budget and retro fitting would have been a pain.
We wound up using our two fireplaces and a woodstove in the basement during those really cold winters and the wood was available from the National Forest Land for free. One of the rangers lived next door. The guys in the neighborhood used to get together and go out and get a pickup load for each one of us on weekends.
Sometimes the house was so hot we had to put on shorts, cause hubby wanted a full blown fire everywhere-burned cleaner. When we put in the apartment in the basement, we took out the wood stove, and put in base board heaters. Bad move. To put in another wood stove would involve putting in another flue or tearing out two of the walls for the bathroom and bedroom.