zlacker

That probably wastes more electricity; heat insulators and clear substances don't overlap very much.

>>yjftsj+(OP)
Is that more heat waste than the habit of constantly closing and opening the door to check what's inside?

>>aydyn+AM1
I don't have the ability to experimentally verify, but I would think so? A window is going to be there 24/7 and air doesn't actually have that high of a specific heat, so you'd really have to be constantly opening the door for it to come out in favor in my understanding.