Well, we bought an electric pet water bowl to keep unfrozen water in the coop. I think, personally, that it makes the water too hot! I can't imagine chickens drinking tea water. I have convinced my SO to keep changing out their regular water that freezes so they have a choice, but the hot water is still in there, eating up electricity, too hot to drink, and MAKING THE COOP HUMID! I can't imagine this is a good thing. That bowl heats the entire coop and makes it feel like a hothouse for plants. We have ice on the inside of the windows, and on the underside of the (metal) roof and even on the lightbulb (a plastic LED light). The coop does have a ridgevent at the top of the roof as well as openings where the roof meets the walls. The windows fit pretty well, but they do leak some air. But it isn't enough to keep the water vapor from condensing and freezing. How do I (tactfully) convince my SO that this isn't good for the chickies?