I have a 4x8 coop for 5 pullets. I originally had 6 but one "she" turned out to be a "he" and based on my city's ordinances roosters are not allowed, so, rehomed he was. I opted for a 'larger' coop due to what I'd read about space requirements and also to help prevent picking, boredom, etc. I attached a run to it, which is 9x12, completely enclosed, roofed and very predator proofed. My question is, will the girls generate enough heat in the colder months to keep them warm, or, is their coop too large to maintain heat and if so, how can I help to keep them warm? I also have a space behind their run, which is about 30x 15 feet that they can also roam in, (that i block off) but due to my high prey dogs, they cannot free roam, so my next question is, are the combined 3 areas sufficient for the birds' daily needs? and yes, as you can tell this is all new to me! top pic is behind their coop/run. bottom pic their 'home'.