One house: I have 14 chickens in a 6x8 foot plyboard house. The back wall and roof are aluminum siding. 1/3 of the floor is chicken wire to allow droppings to fall through. The backside of the house is about 18 inches off the ground. There is a 6-inch round hole in one of the walls near the roof (it was just already cut in the plyboard which was salvaged). The chickens in this house are: 1 sexlink rooster, 6 rhode island red hens, 2 americauna hens, 1 easter egg hen, 1 unknown black hen, 1 white bantum rooster, 2 white bantum hens. Second house: I have 1 white bantum rooster and 1 california bantum hen in a 4x3 foot plyboard condo . They are both young, but not babies. The condo sits one foot off the ground, the crawl-space is closed on 3 sides. There is a 1x2 foot hole in the floor of the house, covered with chicken wire, for droppings. The only ventilation is from the uncovered side of the crawlspace and through the hole in the floor. How do I know the houses are well ventilated, but free of drafts??? How cold is too cold in the houses? I'm particularly worried about the two young ones in the condo.