I live in a 1 bedroom apartment with 2 thermostats - one in the "living" area and one in the bedroom.
Last winter I left the room I was currently in set to 65 and the not-used room to 55. If I was gone, both rooms set to 55
This winter, my electric rates are THRICE what they were last winter. So, if I am home, I turn the heat to 55 in the room I am using and turn it OFF in the room I am not using.
If I am not home, the bedroom is set to 50 (so the cat doesn't freeze) and living room is off.
I used significantly less electricity in Feb 2014 than I did in 2013 even though it was much, much colder. The bill was more than twice as much.