And I thought getting chickens was easy. A little background, I live in Illinois so we get a good mix of all four seasons. I am planing on building a elevated coop with a gable roof and leaving the eaves open and a ridge vent for passive ventilation. There will be windows that open for warm/hot weather venting. I plan on insulating the walls and floor. I have two spots where I would like the coop, my optimal sight will not make it possible for electrical in the coop. My city has no restrictions on coop size(I am limiting it to 4x8 max) but they do limit you to 10 birds (no roosters). So here is the dilema. All you guys talk about this "Chicken Math" so I want to plan accordingly. My plan was to get 4 birds and build a 6x4 coop with 5ft high walls. The coop would have 2 nesting boxes and I could do a 4x18 run with 3ft high walls. 6 ft of the run would be under the coop. How many birds would this support? If I were to change to a 4x8 coop so I have room to grow the flock if I start out with the same 4 birds will they produce enough heat for the winter months or would I need to supplement heat because of the larger coop? Im leaning to building the 4x8 if the birds can support themselves heat wise, and I really want to start with 4 birds. How many can the 4x8 coop support. Thanks in advance for any feed back. Also looking for feedback on overall coop design if something Ive said wont work let me know. Like II said I want to do it righr rhe first time.