My winter coop is coming along and I'm getting near the ventilation stage. I have extra vented aluminum soffet from when we built the garage. I'm not sure if that will provided enough ventilation. I was thinking maybe just justing hardward cloth for more air flow. Here are the details 8X8 coop with 100+ sq foot run. 6 birds for this winter (built it big for meaties in the spring when the hens use the tractor and if I get more hens next year. (trying to think ahead) coop is on north west side of garage to block wind. Upper left overhand is 10 inches lower right overhang is 24 inches. I live in zone 5b, It will get to 0 a few times in the winter. Lot of wind but garage will block most. leaning toward insulating. Here are the pics This side has the 10 inch X 8 foot overhang This side has the 24 inch X 8 foot overhang This is the vented aluminum soffet that I was thinking of using. Thanks for the help.