I would think a black tarp might be hotter inside if you were able to completely seal it off. In the summer, when your looking to stay cool you will not be sealing the heat in as your likely to pitch your tarp higher with doors open. In the winter, when your more likely to seal off the tarp the extra warmth it may provide is welcomed. I have a black tarp and live where summer time temps can top out above 115. My theory is black will let less sunshine through the tarp (the same reason you can sleep in longer) thus providing a darker shade which, as long as I dont seal the tarp off, will keep me a bit cooler. The same idea as sitting under a tree with a lot of leaves vs a bare tree. That's my story anyway, and I'm sticking to it.
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