I've been using this for a year or so in my plant/snake room. Smallish room, but it can keep it at 55-60% RH pretty reliably, even in the dry winter. I fill it with filtered water and haven't had any problems with mold.

https://smile.amazon.com/dp/B07H2717BM/ref=cm_sw_r_cp_apa_fabt1_MYDTFb5AN00CF?_encoding=UTF8&psc=1

Hey, I have those inkbird controllers. They're pretty good. Couple of things tho:

Kinda hard to explain, but you have to use appliances with physical on/off switches. Otherwise it won't work cuz the controller kills power to that appliance, and if you have to push an "on" button, like this one, after it receives power, then it won't work as intended.

Check out a swamp cooler, or evaporative air conditioner. Uses water to cool. You gotta fill it, but if you're handy, you can run a RO water line with a float valve to self fill. It's gotta be an open basin, or top fill to do this tho. Otherwise, it'll leak all over. The one linked has a continuous fill already set up. It also has physical on/off.