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Get an infra red camera and look at the outside of your house. You can see where heat is escaping. Most provincially owned energy companies in Canada will do this for free.
It was minus 30C here in Winnipeg the other night. Furnace was on for less than an hour, inside was 17C. It sounds like you need serious insulation and real insulated windows. I wish I could help you!
davidual
Howard
Are there businesses at the residential end of the scale that can do a detailed energy survey (more than just someone who tells you to get energy saving lightbulbs) and advise different solutions with different costs and savings, etc? Ideally someone independent rather than someone who wants to flog their solution.
I had my central heating on for 5 hours, full blast, last night and that increased the temperature in the house by about 3.5 degrees (up to 17.5) and by the morning had dropped back down to about 12. Ideally I'd like to know whether this is due to poor insulation, poor heating, dodgy windows, etc. and how to rectify.