Fridge insulation

After a trip thru FNQ with a 45l Waeco where I occasionally slept beside it in back of ute in warm weather I had the IMPRESSION that it didnt cycle nearly as much with a sheet of 2 inch foam wrapped around it. This also protected it from bumps & vibration & may have quietened it a bit. No measurements done but must help.

My extra insulation was added to the frig at the same time as a 12v fan and direct 'heavy' wiring from the battery. So i'm not sure how much the insulation itself made - all I know is that the frig now frosts up the element inside the frig when running on 12v, which is a huge difference to the way it was.

The insulation I used was from Clark Rubber - it is a foam backed HD foil and is self adhesive so was easy to fit.

The frig is a Sadec 3 way - about 22 years old.

It's virtually impossible to have too much insulation.
The thickness provided by manufacturers varies, and is always a compromise on a number of factors including size and price.
Adding extra will ALWAYS help a fridges performance, as long as you are NOTcovering an area used by your fridge to get rid of heat (condenser).
Cheers