When I was a kid we kept it at 65 but the heat didn’t work in most of the house so it was effectively “wear 3 layers at all times” weather once November hit. We’d get ice on the wall of the bathroom that had outdoor air on the other side. (Mr. Freeze is one of my favorite Batman characters but this was…overdoing it a bit.)

My mom moved to a different place 12ish years ago, sets her thermostat now at 60-65 during the day and turns it off at night. The kitchen isn’t insulated though so it’s effectively 50ish degrees if it’s windy out. I just got back from visiting home and was super glad I remembered to bring the extra fleecy slipper socks, lol.