I'm not from Phoenix, but I'm in Texas and the 100F temps aren't too far away for us either. Making Belgians 8-9 months a year gets boring, so I got a 4.4 cu.ft. Frigidaire fridge and Thomson temperature controller. I took the freezer section out of the fridge and my 7.9 gallon buckets fit just fine, one at a time. I went with this fridge because of space issues. If I had the space, I would have gone with something larger to fit more fermentors. I tried swamp coolers, but it just didn't work out. I still had wild temperature swings. My beer got considerably better once I started really controllilng my fermentation temperature with this setup.