Mine is set at 80 degrees during the summer. During the winter it is at 60 or maybe 65. I live in an over 100 year old dog trot style house in Alabama with only attic insulation and the original single pane double hung windows.
Even this way, $200+ per month electricity and gas bills are normal. I am working on making some wooden storm windows that should help. Still iffy on spray foam insulation, I've heard of older homes having moisture problems afterwards.