Thank You in advance. We are new to this and were wondering about windows in the coop. My husband built one from a wood box he got at work and added a roof and sliding door and a walk out door with plank for the chickens. There is ventilation under the roof edges. Do they need windows for light or additional ventilation? The size is 4'x4' and 6' high. We will only have two chickens till we can expand.