We control ours by the thermostat, also. Rainbow. Always have done, mostly because my parents have always done it. Ours is a cold house. There is not enough insulation in the loft and walls, so I am going to investigate the offers we keep receiving from British Gas etc. I don't think we will be entitled to a grant.Does anybody know about this? We were away over Christmas, and despite leaving the heating on low, it was absolutely freezing when we got back, and took ages to warm up. What a shock, 80 degrees Florida heat to Frosty England. I'm still trying to warm up a week later