So I just got a used chicken coop in really good shape. I have 2 chickens, but am going to get more in the future. The coop is 3 ft wide by 7 ft long by 6-7 ft tall. I am going to install a couple of roosting bars in the future. But my heat roosting bar is fine for now. I don't have it plugged in because it is summer. Does anyone know how many chickens I can fit in it?