I've tried to calculate whether it's as cheap to run gas central heating with all the radiators on or to turn radiators off in unused rooms. The heating has been on for exactly the same times in the day. In the quarter of November, December and January 2005-6, I ran the central heating with all the radiators on. This time, for the same months 2006-7, there's no difference in price even though I've turned off lots of radiators. I know the price of gas has gone up but I don't understand why the bill should be similar when I've turned off radiators. Is it better to have all the radiators on? Thanks.