We live by the coast in South Texas, in very humid/hot climate in the summer, and I am more concerned about how to keep the birds cool in the summer than warm in the winter. Even when we let them out today to play outside for the first time, one was opening her mouth and spreading her wings. Lots of rain in the spring is also a bit of an issue, though the area where we put the coop is elevated and never floods. We have the so-called "flash floods" - there would be a lot of rain with flooding, then the moment the sun is out, it all disappears, like nothing's happened. So I can imagine the coop area will get wet from rain quite a bit in spring. But heat is more of a concern than the rain. The coop area is near a shed with a large tree branches hanging over creating shade. The coop itself has a covered shaded run as well. But if I lock the birds up for the night inside the coop, they maybe protected from predators, but there is no ventilation inside the coop itself or windows that can be left open overnight. Any thoughts or suggestions?