Hi all, so I’m trying to work out the best way to tackle this issue I have. We have an old unissued chimney breast which has been removed from downstairs and the roof but is still left in an upstairs room and partly in the loft. My issue with this is my house is getting really cold in the winter and really hot in the summer, I’m guessing with the chimney breast being open under the second floor floorboards and being open in the loft that the draughts from the attic is flowing through my house. I was thinking of blocking the chimney in the loft but I’ve read that it needs to stay ventilated?