Yeah, I think most beer won't freeze until around 28dF. I use an analog Johnson controller, which has a 4 degree differential. So, if I want it at 34dF, I'll set the controller to 32, knowing that the freezer will kick on at 36dF and turn off at 32dF. This will keep the beer at a constant temp of 34. I also attach the probe to the fermenter and insulate it (tape and bubble wrap) to get an accurate reading of the beer temp instead of ambient temp. The only time I froze beer was when I accidentally left the probe out of the freezer all together. Luckily I use Better Bottles which are flexible and didn't crack like glass would have. Turned out to be one of my clearest and tastiest beers!