On Saturday, 15 August 2020 09:42:25 UTC+1, Tim+ wrote:
Well, I stuck a temperature probe in my old chest freezer and discovered
that its not really performing to spec. Its a 3/4 star rated freezer (I
think he 4* rating only applies when the fast freeze mode is switched on)
and the temperature seems to cycle between -15.5 and -12 C.

When I turned it off for the hours the temperature rose to -4 C which is
clearly not good for longer term food storage. Fortunately its very much a
€œspare€� freezer thats only been pushed into service to allow us to
stockpile a few essentials should we have to self isolate.

Anyhow, I dont think that the insulation has obviously failed (the case
isnt bulging anywhere) but I was wondering if I could just glue some
kingspan/celotex etc to the outside? If I were to do this, should I glue
the foil side to the cabinet or have the foil to the outside?

Tim


Have you cleaned the back? All the "radiator" fins, etc.

Are you sure it has not lost some gas?

Have you considered placing a very modest fan to encourage better airflow?