The heat bulb will zap moisture out of the air. I'd stick with the UTH only if I were you. If you don't want to switch housing to a sweaterbox or similar tub, you could still make a humidity hide for the snake. I've used everything from used (washed) deli containers to 30qt Sterilite tubs as humidity hides for animals. Just line it with moistened substrate and cover with a lid. Make an entry/exit hole just big enough for your snake to come and go as it pleases and you're done.
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