There are also absorption heat pumps which use an external heat source (Wood Fired, Propane, LPG, Diesel, Geothermal) to cool or heat alternatively. They are us

There are also absorption heat pumps which use an external heat source (Wood Fired, Propane, LPG, Diesel, Geothermal) to cool or heat alternatively. They are usually only used on RVs for refrigeration. But yeah, grid powered heating in a freezing climate will get uncomfortable pretty often. I've always wanted to be able to cool my house using a bag of charcoal or firewood pile. There is a really cool video by Tech Ingredients where he builds a solar thermal absorption heat pump to cool his shop. Instead of ammonia absorbed in water he used a solution of calcium chloride to absorb water. https://en.wikipedia.org/wiki/Absorption_refrigerator https://en.wikipedia.org/wiki/Absorption_refrigerator https://www.youtube.com/watch?v=R_g4nT4a28U&ab_channel=TechIngredients https://www.youtube.com/watch?v=R_g4nT4a28U&ab_channel=TechI...