Originally Posted by Messie

Have you got an open fireplace/chimney?

I noticed a cobweb in my now unused fireplace which was moving quite considerably. Then I realised it was because my lovely heated up air was disappearing up the chimney!

I put an old pillow in a black binbag and stuffed in in the hole - room seems a lot warmer now! I think you can get special blow up bags to fit up chimneys but my method was free and worked!