I am planning to turn a basic rectangular dog house into a henhouse for 6 hens. The floor space inside is about 10 sqft. My basic plans are to put 2 nests in the back about 3" up from the floor, and roosts in the front section about 6" from the floor. The roof of the house will be hinged so it can be opened easily. We will need to construct a sturdy door in front that will let them out into their run. Besides the door, there are no other openings in the dog house. I want to make sure there is enough ventilation without the house being drafty. We live in the southeast U.S., so combating the heat will be our main issue. I'm just not sure where and what kind of ventilation we should put into the house. Complete windows? Small holes drilled through the walls? Would we put holes/windows on opposite sides? Near the floor? Near the roof? Both? I'm assuming since heat rises, we'll need something near the roof. There is a slight (2") overhang in the roof of the dog house. Also, how much "head room" do chickens like/need in their roosts and nests? Thank you for your help. You can see that I'm not an engineer.