Hibernation

Not quite - but close.

So far this autumn we have not had to run the furnace.  We've been heating our living space with stove wood.  

And generally keeping our living area a comfy 72 F.

Keeping the furnace turned-off overnight the temps drop gradually as the fire dies out and sleeping temps of 69 F or less return.

And the next day we begin the process all over again.....