Go to the D.I.Y. part of the forum and look at the Frugal herpers rack system. I have made 2 of them and have 1 set up and the other should be going this weekend. I just have to get the heat tape down on it and hooked up to the thermostats. I have my Helix set at 91 degrees and I am showing a hot (back) at 88 right now. The cool(front) is at 80 degrees. I think I am going to start adding the snakes to it. I am glad that all 21 spots in this system will be full. I have to get the other one set up so I can fill it also. Thanks for your info. If anyone else wants to chime in PLEASE DO!!