I worry that my 4 hens will get too hot during the night in their very small coop. There is only enough room for the 4 of them to roost on one bar straight across the top of the coop. Cozy in winter, but pretty hot, I would imagine, when the coop is 90 degrees at sundown. Has anyone ever tried setting up a summer roost in the run? Would they use it? I have a fairly large, secured, covered run area.