I have four of these so am very familiar with them. I would suggest putting tape on the outside over the holes in the front on both sides of the door to help slow down the air exchange. There will still be plenty of ventilation due to the space around the door and the holes in the back.
I use cypress as substrate and soak it pretty well at least once a day, especially under the RHP. Unlike the paper towels or newspaper it can absorb a lot more water and release it slowly. If you must use paper or aspen then you will probably need to make a humid hide.
I also use two water bowls, one on the cool side and the other under the RHP next to the warm side hide. Shallow/wide is better than tall/deep.
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