>> >>I think they are quite likely to have damp problems at that temperature
>>
>> Plus condensation :(
>>
That's what I was thinking of. If your house is at 14 degrees it's inevitable that there will be areas of outside wall, maybe also hidden by furniture, that are much colder than that. They have almost certainly limited the ventilation by bunging up all the gaps and keeping the windows shut. Human occupation creates moisture. I wouldn't be surprised if they have a fine crop of mould by the spring if they keep it up.
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