im actually going to buy two 200 watt water heaters and build another incubator just like this. then ill wire the herpstat to control each one. i may need more room for the clutches.
Why dont you just get a fridge/mini fridge off craigslist? It would cost you less than one herpstat. Then you could go with a different heating element, such as flexwatt. And thne you would only need one herpstat.