I did an identical build a while ago for a fermentation chamber on a 1.8cf mini-fridge I built a collar for, though I'm doing cooling only (http://www.homebrewtalk.com/f51/mini...-build-343372/
). There are plenty of great how-tos on HBT with wiring diagrams and the like that I used. Mine's been running flawlessly for several months now. The STC-1000 is also referred to as the "eBay Temperature Controller" when you do your searches.