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Dry, lots of ventilation (shoot for 1/2 sq foot per bird or more), shoot for 4 sq ft per bird in the coop and 12 sq ft per bird in the run with full access to the coop during the day. I always recommend a run with a solid roof over it. Enclose everything with 1/2" hardware cloth, never chicken wire and install a predator apron to prevent digging into the run.