Hang on Wenchy ~ You pay half the friggin' bills. Heat one room, claim it as yours and ban him from it. He'll soon learn. Tightwad Welsh
Alternatively, the next few times he is 'in the mood' tell him that you arent because its too bloody cold. That should soon give him the hint.
In my experience the Welsh don't do "Hints" ~ even Baa they take as "Yes please big boy"
I do hope he never looks in here or the bloody Taffia will be knocking at my door.