I have 2 36x24x18 enclosures with an 80 reptile basics RHP each. I use 3 inches of coconut husk substrate. I have a hot spot and an ambient temp that hold great. No additional heat source needed. I would recommend filling in the cut outs you have for lights with wood and seal it. Then get an RHP. No need for uvb with ball pythons. My humidity is great every few days I dump a little of the water as I'm changing it in the cage and can stay 50 - 70 for easy 5 days without adding water. My house is super dry in the winter and it's barely made a difference compared to Summer.
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