We have also had to consider that extreme of weather - hurricanes. An open coop is nice, but when the rain blows sideways for days (fay taught us that), you really have to have something a little more securable. A standard coop with wire and screen (mosquitoes) windows with latchable doors like many posted on the coop page is good. Also shade and rain-proof vents near the floor and roof are a great idea. Mine free range in our fenced yard during the day, so daytime heat isn't a problem.