Rant Alert !

Don’t get the fridge freezer bit PP but kind of understand the heating during winter as left without heating buildings do start to deteriorate very quickly, although I’d say 20 degrees was a bit warm.

Our other place is a 200 year old farmhouse and converted barn half set into the mountain side; all the power is turned off when empty and it is fine. A low or even frost setting should be all that's needed, not 20 degrees, 24 hours a day  That's warmer than our house! The advantage of summers in the high thirties is everything dries out. And I mean everything 
Plus the place gets a monthly airing right through the winter, and it's a modern building.