I have had good results adding a layer of Reflectix to a cooler which extended ice longevity. I am planning to apply it to a fridge to help save energy, but I was wondering how effective it actually is.
This person did some informal test measurements and provides some data to chew on. For those in a hurry the results are discussed at the 11 min 9 second point
If you accept the results, it looks like Reflectix does indeed provide SOME insulation. Considering the weight, cost, thickness and convenience, Reflectix may be of interest to some people seeking just a little insulation assistance in a limited space situation. The reflective surface may help more in a situation where the cooler/fridge is actually exposed to the sun
https://www.youtube.com/watch?v=Epxt30Ws9xE
=Cosmo