Most of my snake tanks have the top covered with a plastic sheet, mainly the BPs though. And also I have a warm damp towel along with the plastic sheet on my female BP's enclosure since she's shedding. I also have a humid hide in there too, and I mist the cage once a day. I do not use my UTH because I do not have a thermostat or rheostat yet. I mainly use a heat lamp with a 75 watt infrared heat bulb. I raised the lamp so it doesn't get too hot, and it does stay between 91F-93F during the day. I'm getting a rheostat soon though.