Thermostat 60F. Thermometer 58F in the coldest room of the house. I am wearing woolly socks, long underwear, a sweater and fuzzy jacket, plenty warm and not bulky.
Now, here is a question for you all. We used to keep the temp even lower, but when we noticed that the refrigerator wasn't running and not cooling the food, we had a repairman come out. He said the fridge was fine, but that since the room was too cool, a sensor wasn't telling the fridge to kick on. Sounds crazy to me, but now we keep the house temp at 60F and the fridge has never had another problem.