I decided to read that response just in case you had anything constructive to say - I am disappointed. (Too much to hope that you can ever be anything but destructive in you attitude to posts) Back on ignore - and another has joined you - you are infectious
The 'cardboard'(hardboard) walls in this flat spread heat between rooms easily.
If I keep my unheated kitchen cool the fridge freezer will have less work to do- ie - it will not need to consume as much electricity keeping the contents cool.
The radiator is at one end of a long oblong lounge.
The gadget will convect heat to the other end more quickly.
I did get GCE O level physics which involved learning about convection currents.