If that's the case, it should retain heat once the plastic heats up. I've got stone hides and the inside temp is just about a degree cooler but they had to heat up under the lights first till it would get that way. Another thing is keep an eye on the plastic and make sure it doesn't melt. I don't think it will but food for thought. If you got anymore questions I'd be more than happy to help. I'm new to this too but have already learned a lot. Hope I could help
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