I only have 4 2 month old chicks at the moment and they are already bigger than I thought they would be at this age and I am loving them. I am planning on posting pics of their house and run and pics of themselves in a few days. Their coop is 8ft x 8ft and 6ft high sloping down to the back to 4ft. Their run is 8ft wide and 10 ft deep and i'm doing the Deep Litter method in the coop. Haven't gotten the egg boxes in yet or their permanent roost put in and right now they are using saw horses for their roosting bar. Anyway, I have a plywood door for the coop and a plywood door for the run also. That way I can get me and a wheelbarrow inside with no problems when it comes time to clean out the coop. Anyway, I got to wondering about the pop door. I go out every morning and open their coop door and leave it open during the day so they can run in and out all day long if they want. In the evening I close their door when they go in for the night. Now, maybe during the winter I may need 1 but I don't really see the need for a pop door. From the experienced chicken lovers out there what are your reasons for a pop door?