I used thick art paper on the sides and back of glass tanks to keep some heat in. On top I made a cardboard cutout that I covered in foil. I left a window for the heat lamp and CHE I was running. Mine was a 40 gallon and I used a bulb on one side and the che on the other so you shouldn't need that now.
How thick is the substrate over the uth? Should be no more than a 1/4 inch.
As long as the ambient on the cool side stays around 75 I'm happy. My snake room often times is between 75 and 77, with a few degree fluctuation each way at times. My hotspots are set to 85-88.
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