Does anybody have any experience with those external thermometers used to control the temperature of a refrigerator? That looks like the only way I can reliably maintain the fermentation temperature since our A/C is broken. What I'd really like to know is whether it would work on a freezer as well as a refrigerator. I had another mental lapse and was looking all over for a small fridge I could get cheap, meanwhile there's a completely unused chest freezer sitting in the kitchen. I don't see any reason why one of those controllers wouldn't work on a freezer, does anybody else?