It won't help with the humidity but have you tried putting a blanket over the top and sides of the enclosure? I usually throw one over my racks that aren't in the snake room in the winter, especially overnight since the <censored> heat pump for the house can't keep up if it's super cold outside, and the blanket will bump the ambient in the tubs up by a few degrees. My main snake room stays warm because of the heat exhaust from the chest freezer for the rats.
High humidity isn't an issue as long as the temperature is correct and the enclosure is clean.
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