Your home needs a heating or cooling system because of building heat loss.Heat flowing in to or out of our home is our largest energy consumer. Without building heat loss, we wouldn't need a furnace at all. We almost wouldn't need a power bill either. Of-course, a home without heat loss is a home without doors and windows and kids going in and out. Doesn't work real well - just like ceiling radiant heat and baseboard heat didn't work real well, especially where our power bills are concerned.

https://jrhonest.org/the-backpack-electricity-system-review/