My dad is such a pain in the ass about this - he'll turn the heat down to 15 degrees in any room that's not currently occupied, and whenever they leave the house. So the place is always uncomfortably cold, there are hot spots/cold spots and drafts. Meanwhile there's minimal insulation in the attic and zero insulation under the floors, and a huge basement that's always cozy and warm all winter, despite the fact that there's no heating in there.

Then he complains about the heating bill and blames me for it (because I cranked the heat when I came over for dinner one night). What a mystery.