I can remember, and if the economy doesn’t get any better I may have to do again, nailing up blankets over the windows to keep the cold out and the heat in. May not look pretty on the inside but keeps it warmer! Good luck.
I made "draperies" for my windows using quilted material. We've been using them for years & they really hold the heat in! The material is already quilted when you buy it, just have to edge it with binding. It comes in colors and patterns and works great.