Before I got a PVC enclosure I had a tank, and one that was rather large. I used the coconut substrate and it had to be soaked in water and then squeezed out well before use. I also used a damp towel on top of the cage, and that's what really did the trick for me. I used a thick beach towel, folded. I wet the entire thing, and then wrung out the water, folded it into fourths and put it on top of 2/3 of the cage. Every night and a.m. I would flip and refold the towel, rewetting it as needed and washing it about every 4 days. That, along with misting twice a day, got my humidity into the right place. It also led me to place an order for the Animal Plastics T8 as it was a constant dance and worry to keep it just right in the tank.
I can't help on your main question, but hope that this saves you the expense of buying a humidifier. I live in the desert with very low humidity, and this worked for me. Hope it helps.
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