I'm a little late asking if anyone uses one of these and if so do you think it really works, I bought one and installed it today. This photo and short explanation in my bolg explains what I'm talking about and how it is supposed to work. http://dalecaldersblog.blogspot.com/2011/05/finishing-touches.html My day old chicks should arrive tomorrow and the brooder is set-up in the coop so if it works I'm glad to have it installed. It's been more than 20 years since I've kept hens and this time around I'm trying to build the most secure coop and yard that I possibly can. In the past I have had predator attacks from dogs, raccoon, weasel and coyote. The few hens that I'm getting will be more for pets than anything else. The eggs will be a nice bonus but I'm a vegetarian so they won't need to worry about ending up in the oven. LOL If you have had experience with this or know of someone who has your comments would be greatly appreciated. Thank you to all of the people who have welcomed me to the forum and made such nice comments about my coop.