covered with a screen and wrapped in Saran Wrap with the exception of some small holes over the hide box. Also the UTH heater is only getting the substrate to the mid 70's and the substrate in this situation needs to stay at the level where it is. Like I said this is sort of like a math problem and I want to see who can come up with the best ideas working with the parameters that I set and thank you Jackel for pointing out that I left out the topper I know that makes a big difference. The Relectix insulation is a great idea.