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- Joined
- 20 Feb 2009
- Posts
- 2,195
- Location
- Ashton-Under-Lyne
@ OP, tell your sisters to just set the valve on their rooms radiators to a comfortable setting, then they wont need to have the window open.
Maybe the house hasn't had the radiators fitted with thermostatic valves? It's a good idea to have it done, but I know a lot of people don't bother as they don't realise how much money it could save them.