My husband is very "careful" with the heating of the house. When he's away overnight for work I put it all on full blast. It's just awesome to have a beautifully warm house for a change. Also, he wants to eat healthily so bans the "bad stuff" from the house. I still buy all that stuff but I leave it at work.
I tend to keep my heat at a lower level (65), but when my girlfriend is over, I do turn it up. Everybody has different tolerances, and what is just fine for me has her with hands and feet like ice bergs.