The BEST trick that I use is utilizing wet towels it maintains 50-60% at all times, once a day wet it in the morning. I have 5 enclosures in a 12x12 room, 8feet is desert the surrounding tanks are tropical...so I have to do it once in the morning and once at night. Damn dragons lol.....Also heat lamps (if your using) sucks the humidity out of the air in the tanks. I'm in Florida and I was still having problems with humidity cause of the two dragon cages and using the heat lamps.
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