Its not been a problem so far, there are small vents right across the back of the coop and the two front pannels detach and usually one is removed during the day. I'm more concerned that its too drafty come the winter, I'm in the UK and temps rarely exceed 25 degrees here in the summer but can drop 10 below in the Winter. I live on the coast so it should be fine. Its definitely not as air tight as it looks lol