That would be getting a good thermostat, and it will stay at that temp, just like our enclosures. (As long as you don't get a leaky cooler/fridge LOL) I really wouldn't skimp on the thermostat for the incubator... I haven't done anything with mine yet, but going cheap on the thermostat is not worth the risk for something as fragile as eggs. So I got a herpstat for it.