I recently rebuilt a house on a smaller lot to move to another save for my Sims to move into after a while. So I move in, and it's winter. I go upstairs and it seems the split-level roof is causing ...
Well I don't know what it is then. If ConstrainFloorElevation cheat was used to make the room then it could be anything. I think at this stage I'll just put it down to being a mystery.