we are getting two leghorn hens next weekend and are feverishly working on their home. basic setup is that we have a 6ft tall fenced garden and will be sectioning off a 20x35 area--using one 4ft 35' section of fence. this will be the chickens' ranging area. inside this yard we'll have a 8ft longx4ft tallx3ftwide modified-A fram (with cupola roof rather than straight A-frame top, so they have more head room.) this will be a two-level enclosure--roost/nest will run the entire length of the coop (8ft, with a nest box at each end and scratching floor/roost in the middle 6 ft) and the ground level is for them to scratch and peck when they aren't in the large yard. food and water will be on the ground here and bottom of coop will not have fencing (so i guess this is a tractor by definition?) very similar to the catawba coop seen here... http://www.catawbacoops.com/the-catawba-converticoop-chicken-coop-image-gallery.html questions. i notice none of the catawba coops have ventilation or windows. now i'm not using his plans, instead i searched out lots of designs to see if i could find one similar to what we came up with, and that was it. but dang, if so many happy customers of a design similar to ours don't have ventilation/windows, what gives? i thought that we might attach/retrofit a door from a dog crate to each nesting box opening so that when you bring down the nest box door, you then have to open the wire door to get at the eggs. this would allow light/air in the summer. any problems y'all can see with this idea? how cold does it have to get to need insulation? we are in extreme nw arkansas--zone 6. it's rare, rare--maybe once a winter--to get down to zero here. much more normal "really cold days" is 12-15 degrees--get about a couple dozen nights that get that cold. is there a guide to when you need insulation? we don't have the option of electricity in the coop at any time. i have to say that i see many rather shanty-esque backyard setups here that obviously don't have any insulation. i know breed has a lot to do with this too. we are going with the leghorns, other suggestions wrt dealing ok with not so cold winters and also some very hot (90-95 or so on many days) summer heat? we are in the country. the 20x35 yard i mentioned...i know the birds will be easy prey for raptors. i chose leghorns because they are dark and fast-moving and not such "sitting ducks". other suggestions for birds that can forage, move quick, are darker, and are suited to our clime? i need to make sure the hens stay in their yard. the landlord made that clear...we live in a tourist attraction so it's important. any way to predict whether they will fly out or if i'll definitely have to clip wings? thanks so much for your input.