On Thursday, 24 October 2019 19:28:10 UTC+1, ARW wrote:
Of course any cat owner will tell you that this does not matter as all
doors must be left open at all times so all the rooms are the same
temperatu-)

No, the doors must be left open at all times so the cat can walk from a warm room to a cold room because he's too hot, then ask you to turn the heating up in the cold room until it's warmer than the warm room...

Owain