I have 24 chicks that are 3 weeks old. Our temps have been as low as 22 at night to 68 during the day (South Georgia). I moved the chicks from the brooder into an 8x8 coop that is 7' tall in the front and 5' tall in the rear. I have read the ventilation section and it has a lot of great info, but most of it seems to deal with matured birds. I have the chicks contained in an area that is 8'x4' feet for the time being. I have a brooder lamp on one end, so they have plenty of room to get away from the lamp, but most of the time they stay within a foot or two of the lamp. To say I am confused about the ventilation is an understatement. I have a storm door, the glass can be raised to expose the screen. What kind and amount of ventilation do I need at night if the temps are in the mid 20s to low 30s. I plan on selling some of the chicks as soon as I find out how many roosters I may have received. I do not plan on keeping 24 grown chickens in an 8x8 coop, but right now they have more than enough room. Tomorrow I am going to open up the entire coop to them. I have not added any windows yet (new coop), I thought I would wait till the temps quit dropping so low at night.