Not sure if it was my imagination or not. We have a small “water closet” on the ground floor and while visiting it last night I closed the door tight. The rooms were warm last night (70 – 74). Then out of the blue, the door swung open wide as if someone had yanked it open. Of course I said “what the @(#*” and realized that the room had instantly gone ice cold. Not saying it was a ghost, but it did seem a bit disconcerting at 1AM in the morning.