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I would provide plenty of ventilation only because Florida gets hot summers. Adequate space in the run and constructing the coop in a shady place is important as well. Just from experiencing the hot weather in Texas, I don't believe my flock would of survived if I hadn't setup their run in a corner with the shady trees.
On this link you'll find lots of information on almost every aspect of keeping birds - from coop building ideas, to incubating eggs - https://www.backyardchickens.com/articles/
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