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Strongly agree, had much the same experience. Not cheap stuff but lasts for years. In a house it quickly paid for itself.
If they don't hang out in the coop during the day, you don't really have much of a problem. I have a metal roof and a much warmer climate than yours, and when I fence my chickens, they do hang out there during the day for the shade. That's one reason I free range them now, that and the dogs are trained now and keep foxes etc. away. I still run a box fan all summer so at least the hot air is moving. Also hosed the roof down at times in the worst of the heat, before the chickens took to the woods during the heat of the day. Considered insulating, but the hottest part of the day is around 5 PM, so last night's cool air is long gone....