I'm no electronics expert. But having read a bit about the Arduino (relatively inexpensive, open source, programmable microcontroller), it might be the path I'd pursue for something like this.
E.G. here's an Arduino being put to use for temperature sensing & control:
Arduino Beer Thermostat
Quote:
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Sean shows us how to use an Arduino for kegerator temperature control. A Kegerator is a beer keg built inside a refrigerator. Anyone want a cold beer? He discusses the home brewing process and how a microcontroller can be applied to this and many other sensing and control task. Man I’m thirsty now…
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