I am not sure how this works (having studied physics and thermodynamics), but it’s currently 66 degrees in the dining room where the thermostat is located, but only 61 degrees in the bedroom. I’m fairly certain that hot air is supposed to rise.
Of course, I do have a fairly plausible theory… See, the stairway that leads upstairs ends at the front door, which, I have noticed, is extremely drafty. I tried putting a towel in there to cut down on the drafts, but it didn’t work. So my guess is that the air is coming in the door, and probably heading up the stairs. There’s also a drafty window in the bedroom, so we’re going to get some window insulation film soon to try to keep the room warmer (it was about 63 degrees last night – thank goodness for a down comforter!)
This is not actually our window (I got it from a Google image search).