I have a wine cooler brumator. I am in South Florida where it is necessary to cool snakes about fifteen degrees from ambient, so it is pretty good. The limitations are that it always cools relative to ambient temps. One night it got down to about forty and it chilled the same eight degrees or so and got really close to freezing. They are also not very big if you have a lot of snakes.
I would recommend using a refrigerator and a Johnson Controller thermostat. You can find them from beer making supply companies. I guess temps are critical when brewing beer? It might be what Chris saw being used, except they are about triple in price now. You plug it in and then plug the fridge into it, very simple.

Here’s a link-

Thermostat

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• wine coolers to brumate - wohlerswi, Tue Jan 27 14:30:12 2009
• RE: wine coolers to brumate - chris_harper2, Tue Jan 27 15:27:56 2009
• RE: wine coolers to brumate - Upscale, Tue Jan 27 17:02:35 2009
• correction... - chris_harper2, Tue Jan 27 17:17:15 2009