We got chickens in June. They are just about egg-laying age right now. I wanted 5, got talked into 6, when we went to buy them it somehow became 7. Their enclosure is 4x8', just wood frame and chicken wire, with a 2x4' coop up in the corner, with an aluminum roof over the whole business. So all told, they have 32' of outside space and 8' inside. The coop has 2 (big) nest boxes and a dowel to roost on, and the floor below the boxes is just chicken wire. The door is just a chicken-sized hole in the wall. I feel like this is not quite adequate for the size of our flock, but the only option is to lose a few hens. Now that fall has arrived and it's getting colder I worry about their comfort. My plan is to install a real floor in the coop and maybe some sort of flap for the door so they at least have a space that is completely enclosed at night, and my husband says he'll wrap the whole run with a tarp when it gets really cold, and put a heat lamp in there. When do we need to start that? It's been pretty cold around here (Western Washington) the last few nights, but not freezing. I don't really know anything about chickens, so I don't know what kind of temperatures they can take. Any help will be greatly appreciated!