My living room is at least 4-5 degrees lower than my bedroom, because it has huge windows and it is my belief that I am losing heat because of this.
The thermostat is in living room so that messes up my heating/cooling. I set it at 24 at first, but then my bedroom became like a furnace (I think my computer can single-handedly heat my entire bedroom). So then I set it at 22, making my bedroom warm enough that I can walk around in shorts and t-shirt. The problem is that when I set it at 22, the furnace rarely turns off because the living room can barely reach 22.
So the short story of it is that when I watch tv in the living room, I'm curled up on my couch bundled up under a comforter. When I'm in my room, I'm lying in bed with a t-shirt and shorts. It's summer in my bedroom and winter in my living room.
Weather stripping and caulking is probably the answer. I'm going to look into this perhaps tomorrow at Lansing and see what I can do about this. If I can even cut down on half the heat loss it'll probably save me a few hundred dollars on heating.