Last night I was thinking about testing a cooler incubator. I know a lot of people like to use water bottles and some like to not use them, plus I know air is a pretty good insulator, thus leaving me with 3 different setups to test (incubator, incubator with water in it, and incubator in a larger cooler, with an air buffer between them). From there it would be fairly easy to test the cool side of things by surrounding the incubator with a controlled amount of ice inside of a larger cooler. The hot side would be a lot harder and could require a space heater in a room...

Anyway, it would be cool to do and would give us a better idea of how to build an incubator that reduces the amount of temperature fluctuation the eggs would experience.