We'll do our best to help you with the heat and humidity issues. Hopefully they don't impact his health before you get him into a screen cage. One thing you can do is reduce your misting duration to 15 seconds or less every 6 hours and just hand mist first and last thing to up the amount or run a dripper that drips into a collection cup covered in screen so you don't have as much excess. Drippers can just be a cup with a pin hole filled with ice cubes to slowly drip as they melt. Hand mist less in the morning and more at night. It won't boos humidity as much as a mister.
In our side converstion I told you a small USB computer fan might help with the air circulation hoping you had one on hand. You might find a small toy fan at the dollar store. You don't need it to blast just move things around a bit. Walmart has some from 6-20$.
I don't use any additional heat for Jacksons under 4 months beyond what the fluorescent provide. He looks older to me but it's hard to judge without something to provide scale. Either way he has a lot of horn.
@Mendez,
@Kaizen and
@leedragon what age do you think he is? I'd guess 4-6 months? You also won't need the basking light on all day unless your house is frigid. Mine come on an hour after the UVB and then for a couple hours and then occasionally for 30 minutes thru the afternoon. They like to bask more than they need to.
One more thing for now. Don't give him calcium with D3 more than once a month. Here are schedules you should check out.
My Jackson's Supplement Schedule