Here are some pictures of a minifridge that I briefly converted into a computer. This was back in 2005-2006?
Glued a crappy motherboard to the fridge door, stuck a crappy PSU in the fridge, and voila - a really impractical, shitty computer booted to POST.
Yup, it works.
I was sure that condensation would kill it, but it never died. I threw it out in working condition.
It actually stayed at a decent temperature - rarely rose above 20 Celsius.