Not a ton of experience here but I think the circulation of the air from the fan simply draws the humidity out of the cage. That's why I've installed a humidifier specifically for the cage to kick on when the humidity drops below a preset %. I can bump it up during shed and lower during normal times. My girl is currently in a 24x18 glass cage that I've had to modify the crap out of to maintain temps and humidity. Just got an AP T10 (48x24x15) that I'm currently setting up. Hope to not have to tie in my humidifier on this set up but if I have to, I know it'll work from my experience with my current set up.