Another vote for a vinyl flooring remnant. It should be covered with litter at all times anyway, but it super easy to keep clean.
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I personally don't use one, although it does get hot and humid here, my chickens do fine. My coop and run are pretty much in the shade all afternoon. Here's a thread link discussing fans, that might help you.
https://www.backyardchickens.com/threads/what-type-of-fan-works-best-inside-coop.657693/