Hello there BrewGeeks. Temperature control is one of the last great frontiers to achieving the best homebrew possible, usually because it’s not easy to dial in the perfect temperature. Cost and specialized knowledge can factor into how this is accomplished. A common method is to buy a freezer and hook up a johnson style controller to help maintain temperature. This device allows the brewer to set and maintain a temp by turning the freezer on and off. It works well, but does have a few shortcomings. First, a single-stage unit is focused only on cooling and does not connect to a heat source to raise the temperature when necessary. This means when it’s set to, say 55 degrees, the actual temperature in the freezer can fluctuate within…
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