We have 3 RIR and 3 sex links that share a henhouse (they are almost 9 weeks old). We have screened gaps in the roof that allow for some ventilation. In the evenings we close the door. We live in Eastern NC and it can get quite warm and humid here in the summer... how is the best way to make sure that they are not getting too hot in there in the evenings? They are in a tractor which is pretty secure, should we consider leaving the henhouse door open on hot nights? What do you guys do to make sure your birds aren't getting too hot? We could install more vents (I've seen where some people install the vents used in the floors/ceilings of homes) but I would think that would compromise the warmth in the winter. Which is my next question... how cold is too cold in the winter? They seem to generate a lot of heat on their own (which is why I worry about overheating the henhouse in the summer). Any advice appreciated!