I think the next level of after heat pumps is complete heat management. Waste heat from kitchen exhaust? Heat pump. Hot water down the drain? Heat pump.
Fridges are some of the most efficient appliances in the home but I always think it’s funny that in the winter we keep the house warm and the fridge cold, when we could just harness the cold from outside.
Actually I wasn’t sure. Hard to tell on the Internet. Some people really forget others exist who live in different circunstances than themselves.