Helix and Herpstat are great choices, but why not save $100 and get an On/Off thermostat like a Ranco? I got one off ebay for $50.50 shipped and spent $7 on a power strip and heavy duty extension cord, so less than $60 total for a quality thermostat. I currently own 3 Rancos and they work great for me. But for incubators, Herpstat all the way!!