7 out of nine hatched the first time I used it! So I made this cooler-bator in a pinch and have upgraded it since. It was easy to make and not too pricey as I had most of the items needed from an old cooler-bator. Maybe someone will find my design helpful! When I first used this incubator I just lifted the top to vent. Now I have two vent holes (one on each side) that can be covered. Also in the second picture you can see a green straw that goes to a tray on the bottom of the incubator to add water for humidity! The first time this bator was a still air I now have my fan from my old cooler-bator incubator working perfectly in this one. I use a dimmer switch attached to a 15 watt bulb for a heating source. I don't have a fancy automatic turning machine so I use an egg carton cut in half on 3/4in pipe and rock the eggs 3 times a day. I will be doing a hatch in August of a dozen easter/olive eggers. Hatch day will be August 21st! I will keep this thread updated!