A while back my dad and I built a plywood incubator, and put styrafoam in it a insulation. A year late I decided that the temperature jumps more than a rabbit on carrot juice. My dad wired a water heater thermostat into it, and it turns off and all, it just either stays 7 degrees too cold(93*) or 7 degrees too hot(106). Too hot if I turn in the LG heating element, or too cold if I leave it off. 97 and 102 are the cosest I've gotten. So far... I have two heating elemnts as well, but they're on the sides for emergency use only, and as an added heat source when the weathe is beow 60 degres farenheight. It has plenty of ventilation which I can covr up(it makes NO difference). It's well insulated. It doesn't get direct sunlight except really early in the morning, on the rare oucasions the curtains are not drawn. I intend to put my eggs in tomorrow(was gonna today, for the Groundhogs day hatch, but I'm a bit too late...) so I really wanna fix It. I have two pictures in my album(chickens and incubators is the title) so if anyone has any suggentions on perhaps how I can fix it, I thank you in advance. Or if there are any cheap thermostats less than 20 bucks that work? That's good too.