Quote Originally Posted by Pennstater6 View Post
Ok what substrate holds heat well? I have repti-bark on him now but I have cypress mulch for my boas cage. Should I use that? That mulch isn't in the boas cage yet its still in the bag. Do you think the substrate will heat up if I give it more time?
Wood mulches block out heat. If you want to stick with a wood substrate Aspen will let the most heat through, but even still you want to have as thin of a layer as possible. Eco-Earth in thin layers will also work well.

Air is an excellent insulator. The air pockets between wood shavings/mulch is what blocks out most of the heat. By eliminating these air pockets paper based substrates like paper towels and newspaper transfer nearly all of the heat from a UTH to the snake. Which saves electricity as an added bonus!