What you have is what I would think is a common problem with small coops in cold climates. With a small coop it can be difficult to create an area where the chickens can have ventilation but still stay out the draft. In my view the best option to get a good air exchange going without undue draft is to have a long and deep coop with the ventilation on one end and the roost area at the other which would create something akin to a "pocket" of protected space in the roost area. This is basically what P.T. Woods and H.H. Stoddard designed for their fresh air poultry house styles...deep pockets of protected space but with a large expanse of screened window to allow warm moist air to escape and for fresh air to enter. This is not like a flow of air through the coop that passes from end-to-end but rather a more subtle exchange of good air for bad air at one end of the coop....from many peoples reports it works quiet well. In your area of strong wind and severe cold I believe a setup like this would work well for you. You may wish to build a baffle of sorts to place in front of the vents to help block blowing snow from entering. In the summer simply open all vents and maybe replace the solid door with a screened one.
Since you have some time you might want to read P.T. Woods "Open Air Poultry Houses for all Climates". The book that is linked to is the public domain version, there is another version with a few refinements to it that is printed by Plamondon Press that can be purchased in print (I like paper so I bought it
). Here's the link to the free one... https://books.google.com/books?id=o...=onepage&q=stoddard fresh air poultry&f=falseHopefully this will help and hopefully even more that I haven't been too confusing.
Best wishes,
Ed
