|Old houses suck. All you folks who live in shiny modern airtight houses and can afford to heat it into the 70s all winter long are lucky
not everyone who heats their houses to 70 or higher or even lower but still higher than you keep yours has a new shiny modern airtight house.
Some of these people live SOUTH of you & therefore don't need to use as much heat at night becuase it doesn't get as cold.
Some of these people have made improvements(or landlords did or previous owners did) on their houses to insulate them better so they're not heating the outside & it doesn't cost as much.
Some of these people have a different heating source that isn't as expensive as heating with oil is.