We have had our chickens for about 3 months. I am busy finishing the chicken house, but I have some concerns about how much ventilation to build into the chicken house. The chicken house floor is about 8 feet by about 5 feet (so say fourty square feet). We live at 4,800 feet, and it gets below freezing during some nights in the winter. Usually, about 10 to 30 degrees at night. In summer, it gets hot (say 70 degrees and into the high 80s on most days). At night in the winter, should you close all vents to keep the chicken house warmer? For summer, how many square feet of ventilation should you have? Any suggestions most appreciated for those form similar climates.