I'm having difficulties with window design and would like some help from other builders out there. Coop is 55 ft2 and based on what I've read, it seems like I would need about 6 ft2 of ventilation if not more. I live in a cold place (Maine) and am most concerned about all the time they're going to be inside for those long winters. I am tentatively planning to vent the gable ends and put four small windows on the two short sides. I will staple hardware cloth (outside, under the sheathing) and mosquito netting (inside) but am thinking about also using some plexiglass on the four small openings. Square footage of the above should be between 8-10 ft2. My idea was that rather than make them capable of opening and closing (two of them are inside the run, a bit of a frig), I would simply fit the inside of the openings with a insulated panel that could be applied when it got really cold; of course that would be the end of the light (and ventilation) from those windows. The gable end vents I plan on just leaving alone, with hardware cloth and mosquito netting so there will always be some light and some ventilation. At any rate I am only going to worry about getting them good ventilation right now and will worry more about the cold later. Any and all advice appreciated and taken to heart.