https://sparenergi.dk/forbruger/spar-energi-i-dit-hus https://sparenergi.dk/forbruger/spar-energi-i-dit-hus <- Danish Government Office for Energi (but in Danis

https://sparenergi.dk/forbruger/spar-energi-i-dit-hus https://sparenergi.dk/forbruger/spar-energi-i-dit-hus <- Danish Government Office for Energi (but in Danish). They say 18 degrees, to avoid issue with moisture. It very much depends on how the home is built I'd assume, because holiday homes are normally kept colder, down to 5 degrees, during the winter.