We are currently building our first coop. We decided to go with an A-frame movable tractor because it was the best choice for our terrain. I've been trying to read as much as I can and modify many of the designs posted here to accomodate both the hot summers and very cold winters (-10 plus high winds @ 85 mph). I like the idea of having a lot of ventilation for the "fresh air style coop, but I also know that with the severity of these winters we could have some serious problems. We don't have the ability to run electricity to the coop for a heat lamp, and we don't have the funds right now to invest in a solar or wind set up (though that would be ideal in the future). So right now we are planning on having a metal roof on the coop with spray foam insulation between the metal roofing and the 1/4" plywood that is exposed to the interior of the coop. The floor of the coop is going to be 1/2" plywood with sand on the interior and the exterior of the floor is going to have some insulating board added too it. We decided to do the adjustable ventilation design foor the roof based upon the following plans: http://www.southernagrarian.com/chi...en-ark-project/building-a-chicken-ark-part-3/. We have the potential to make it really tight so that there are no drafts, but then there would also be no air flow at night until we open it up again in the morning... The other option would be to add a small (6") area at the peak of the A-frame where it is just screened in and venting 24/7, but I don't know if that will be harmful for my babies in the winter... So my options I guess are to either have no air flow at night or have a little bit of airflow that will also let the wind and cold air in during the winter... Please Help! Thanks!