Okay. Fresh air coops and Ventilation:
This is an open air coop. If I ever made another coop it would be this. That front end is open all year round. The top windows to I believe. Plus there are windows on the side. This is a coop a BYC member made following the old plans the old timers used to use. He never has a humidity problem. I tried to follow this plan but with my hoop coop. It really makes its simple. And proves cold wont harm the chickens. Their down feathers are great insulators and they tend to snuggle with each other so its like a giant chicken sleeping bag![]()
There are different styles of fresh air coops. The one shown above is the "Woods Style". In the winter the ONLY thing that is left open is the front side. ALL OTHER WINDOWS ARE CLOSED. This provides the situation that (was it Scott?) referred to in which a pocket of air remains near the front but there is no draft because there's nowhere for it to go. These coops are faced AWAY from prevailing winds. You'll also notice on this WOODS STYLE that the pop door is near the front. It it were placed further back it would "undo" the "no draft" status so it needs to be placed where it is on this coop or on the front. On this particular style the other windows - on sides and in the monitor top, are opened up in the summertime only.
There are other fresh air style coops that don't have the monitor top but the idea is the same. They are all based on some specific depth to width ratios that create that air pocket near the front; roosts are placed in the back wall farthest away from the open fronts. Again, no drafts.
The classic book was already mentioned but I'll post it again. Definitely worth reading to get the idea of MANY STYLES (not just the Woods style even though he was the author). It will definitely help you get the principle and plan on how to build or place windows for the future. I own the book and refer to it quite frequently when planning.
http://www.amazon.com/Fresh-Air-Pou...d=1384385384&sr=8-1&keywords=open+air+poultry
(These people should pay me a percentage I've advertised for them so much

I like owning hard-copy so I have them as an "in-my-hands" reference personally.

BTW - Jack, who owns the coop in the photo above, says it stays about 10 degrees warmer inside than out.
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