There was an article I read on that solar powered website that's been shared on HN a few times that changed by view on heating.
https://solar.lowtechmagazine.com/2015/02/heating-people-not...
Basically, just wear a sweater and long pants in the house in the winter so you don't have to heat it so much. And if you need to, put a heat source near you, but there's no need to heat the whole house.