Custom Refrigerator

[KillerKellers]

OK, now we're getting closer. I'll make the cold box out of spray foam insulator, in a cylinder just big enough to hold a corny keg, beer lines, and the guts from a fridge I can get nearly free off craigslist. CO2 tank kept externally. Base will be 2" styrofoam, and lid (with tap sticking out) will be held in place like on a pickling jar. I'm liking this.

You may need some area around the keg for air to flow.. and probably want a fan in there to keep air moving. Guess the positive side of a single keg system is that you could tape the sensor to the side of the keg and your beer temp should stay within a couple degrees of desired temp!

 

[TakeAway]

If I were you, I would look for old models of refrigerators, they are quite small and even if you have to give it up for repair, for example, in https://www.sfappliancesrepair.com/ it will still cost you less than buying a new one!