I have an 8x6 coop and a 15x15 run. How many chickens would you think would comfortably fit in here and stay warm in the winter. I have 16 chicks right now (5 bantams and 11 standards) but have a feeling I need to sell a few as they are getting bigger but I want them to stay warm this winter. As of now, we are having no pecking issues whatsoever -- a pretty chill bunch. They free-range for a couple hours in the evening. Thanks for your help