I live in Central Indiana and our Winters get fairly cold. I have 3/4 of an acre, in the city, 10 regular-sized girls. Our run is approx 25*10 and our coop is approx 8*5 (which is not insulated, but vented well). This is my first Winter with the girls any any advice or tips would be greatly appreciated. I just want to make sure early on, in case I need to purchase any items. That way I can buy them slowly so dh won't know how much I actually spend on these chickens!