In reply to NottsRich:
Interesting, I might try and get hold of some metal and compare how the air feels upstairs throughout my house.
I'm aiming for being able to leave my heating off in my terraced house and the doors open, and having the attic bedroom warm enough but not hot.
I seem to take after my Dad in being 'warm blooded' as my Mum would put it, and not needing much bedding at all during the winter, one plaid wool rug/blanket is often enough.
It sounds Spartan, but it isn't from me being quite warm generally. If people come round I'll put the heat on.
Post edited at 00:32