How come I have never heard of this on this website? In case you are unaware of what it is, it's an upside down box that sits just above the ground. It allows the chicks easy in/out access but is meant to keep the heat in. Most don't even seem to use the 250 watt heat lamps for them. I'd imagine that even if you don't live in the frigid north it'd still save electricity and if you do live in the frigid north it'd extend the chick raising season. I'm starting my build. My brooder is built into my shed. So I'm just building it into the corner of my brooder. The scrap I had laying around was four feet long and about three feet wide. I have the 250 watt heat lamps already but also have been using a dimmer switch and this would be another great application. So I'm wondering what everybody thinks? Do you use this design? Do you mount the lights on the side or top and why? Thanks all! Pics of my current setup.