Honestly I'd be worried that you could also end up with a mold issue with all that warmth & no ventilation. I know it's more expensive & more effort, but IMO the best thing would be an up-duct- with a fan, like they install in bathrooms. You definitely need something for that "room", so you're not cooking your snakes- they shouldn't be 84-85* with no options to be cooler, & what if something comes up where you can't be home to open things up sometime- you know, things "happen"- I wouldn't want to risk harming my animals.
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