I used an attic vent that I bought from Habitat for Humanity for $5. It is on the west facing wall. We get some big winds here that typically will blow in from the southwest - so that wall will get a lot of wind. My two roosts are close to that vent. As far as I can tell, the way the attic vent is made hardly any wind blows in but it allows for ventilation. I climbed in the coop just now & just stood there & no wind blew in from the vent & it is very windy today with gusts to 50 mph! (but I do feel drafts from the roof - see further in this post) In the winter, should I make a covering for the top of this attic vent to keep cold air out? We get into the 20's at night and sometimes into the teens. I could make it so that the bottom stays open for ventilation. Here's the outside of the vent - it is 24" wide x 30" tall. Here is the inside - you can see the roost in front of the vent (there are 2 - 2x4s, 2 ft apart): I am having drafts from the opening under the roof - any suggestions with the roof area? You can see the attic vent to the left. The older vents are from interior ac vents that do close. The drafts I feel seem to be coming from under the roof. Thanks everyone!