Most plastic enclosures are PVCx or expanded PVC (it has little air bubbles in it) it is not the most efficient to heat through but not horrible either. If you have some flexwatt or similar around just try it unregulated ,empty and see what temps you get. I only lost 32-3 degrees usually 1/4-3/8 . I set 93 and get 90 it is easier as your room is heated to correct ambients anyway.
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