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Our thermostat doesn't work very well with timings or whatever so to turn on the heating I have to set the target temp to higher than it is and later remember to turn it back down. The lowest it'll go is 5 and the past week I've woken to it running. That said we currently don't have a floor in the kitchen or a ceiling in the bathroom so I know where the heats going.
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Eesh :(
That's not good for you or your house. The general consensus is you shouldn't let your house drop below 15 to prevent mould. I don't think this is practical for a lot of people (we've currently got rooms that can get down to 9 without the heating on and it doesn't seem to cause problems) but I would be a bit worried about what 4 could be doing to the fabric of the building, the health of its elderly vulnerable occupant aside ;)
4.4C in my bedroom when i woke this morning
ice on the inside of the windows .... damn single glazing
central heating now on