I have a Brewhemoth conical and I made a modest fermentation chamber for it out of 2" blue foam. The inside dimensions are 2'x2'x6', so 24cubic feet. I bought a Johnson controller and originally was thinking I'd put a small window AC unit in it, but I've seen some chambers that were cooled by a dorm fridge and that would let me site this thing wherever I want instead of at a window. So my question now is, how big of a dorm fridge do I need to get the chamber to 50F? Would one of the really small ones be enough? How might I go about figuring this out? I may not need to cool until spring since this unit is in a basement garage that is relatively cool in the winter.