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Where are you based? I have access to a thermal camera.
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That is showing you lost 4 degrees in the first hour which I find terrible, was the door open to the rest of an unheated house?
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my central heating hasn't been able to get it to that temperature
You have those radiators that look nice but don't work, don't you? We have one in the loft room, and it just makes the boiler spin its wheels continually heating it as it can never get the room to temperature. Double panel convector is the way, but they look shite. But by god do they work.
Out of interest do you know how many KW/h your boiler is? It might be that the boiler has the capacity to heat the house and then some, but the rads don't release enough of it and act as a bottleneck. Or the entire system might be woefully under-specified.
work out what is going on
Can you take a temperature reading on the external wall? You'll also (probably) have at least one internal wall that's directly connected to an external wall and these will act as further heatsinks (any heat you put in to them just bleeds out via the external connected wall). Check the temperatures of those, too. Those cheapy IR guns will do the job.
Maybe this is a bit obvious but if you have a single skin wall house, with no underfloor, internal or external insulation, it will just bleed heat really quickly as the walls and floors themselves are fucking cold and just pull the heat out. There's probably a calculator around that shows you how much kw/h you lose based on temperature and area. That will give you an idea of what you need to put in to maintain a temperature.
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eskay
greentricky
Howard
@aggi
Cheers for the various thoughts on my place.
I got a little electric heater the other day to try and warm it up without ending up bankrupt and have been pondering what that suggests.
Turned it on in the living room yesterday morning and it got the living room up 6 degrees from 14 to 20 in about 90 minutes (my central heating hasn't been able to get it to that temperature). Turning it off though and the temperature drops pretty quickly, back down to 14 in about two and a half hours and continues below that.
Issue seems twofold, with central heating not able to heat the rooms and rooms losing too much heat (although I imagine solving the second problem would help to fix the first).
Not sure how external insulation would work on the end wall. The other side of the wall is the pavement so don't know whether I would be able to go over any further (or how thick external insulation is).
Temperature in the loft seems to remain fairly uninfluenced by whether the heating is on so I don't think I'm losing too much heat there. My double glazing is pretty shonky so may be an issue there.
Undecided whether to get a thermal camera and try and work out what is going on myself or trying to get someone in. I've contacted a few companies but I suspect everyone probably wants this doing at the moment.