I challenge anyone to show me a home made queen cell incubator that is uglier and cruder than mine. I made it from 3/4" foam board. After a week or so,I realized it fluctuated a bit with the room temperature. I didnt want to buy more insulation so I taped scrap pieces onto it. Hey my motto has always been,it doesnt have to be purty,just functional. By the way, it works as good as a store bought one. I do use a high dollar Herpstat thermostat and 11" flexwatt heat tape for the heat source ( with a computer fan ).