At 65° we still have the windows open! :)
We heat with wood and don't build our first fire of the season until December.
Then we only stoke it until around 3:00 or 4:00 in the afternoon....let it die out. We like it cool for sleeping.
In the coldest winters, we awaken to temps of 50° IN the house!
Good way to get you "Up & Movin" every morning!!