On 23/02/2021 09:39, Clive Arthur wrote:
Don't waste money on expensive air-source heat pumps, just put bottles
of water in your freezer, then when frozen leave them outside to thaw
before popping them back in the freezer.


Even easier if you have an old freezer - take the door off, mount it in
a disused doorway/window with the inside of the freezer facing outwards
and voila!