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I live in Alabama so we have basically two seasons coldish and wet (rarely colder than 5℉) and boiling (90-100℉ with 60-90% humidity). The roundhouse should keep pretty cool but the concern is keeping it warm and the walls not melting from the rain. What would be the best insulator? Straw wouldn't be hard to obtain, vermiculite swells with moisture, and I have no idea where to get enough perlite or pumice.