My coop is 4x8. We have a window that's 1.5' x 2' and. 15x15 chicken door. The roof is metal with a vented ridge cap. DH thinks it has as much ventilatioin as possible, thinks adding more would be redundant. We are in middle tn, hot hot hot, so I'm concerned. Chicks are only 2 weeks, so still indoors. Think it's enough ventilation?