Yes, I have heat tape down the back. It's hooked up to a dimmer on low. My backing material is foiled faced hardboard insulation, the sides are also covered with the foiled faced board, the way the 1" pine frame works out it creates a nice "frame" to fill in. With my rack enclosed more, the heat radiates from the back to the front. The heated side of the tubs are 86-88 and the cooler side is 80-82. No-lids the plastic of the next shelf is the "lid", and the tubs are drilled. My snake room is currently in the basement. As we improve the room I can change or "take away" from the rack to maintain the right levels. I also have that subtrate that does hold some of the heat so in a way there is "belly" heat. This was just the first rack I've built in a while, long while. My next one I may put in the belly heat.

Hope that helps,
Greg

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