I might get flamed for this but it worked for me. I used a cooler with water and a fish tank heater (thermostat built in) in the bottom. I used an elevated floor with holes in it and placed eggs in Tupper ware containers full of vermiculite. This gave me plenty of humidity, air flow was not an issue and although the fish tank heater was not accurate to the temp the eggs needed to be at, it was consistent. Once I figure out what setting to leave it at to give me the ambient air temperature I wanted, I just left it there. I successfully hatched multiple clutches of house snake eggs and a couple clutches of chondropython eggs with an 80-85% success rate if I recall. It was about 18 years ago.
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