Hi all, I have read tons of info about drafty coops and ventilation and not using heat lamps etc. Here is my question. I have 3 chickens who live in a pre-fab coop very similar to this one: http://www.homedepot.com/p/TRIXIE-C...40&gclid=CNCvifCxzMgCFU3t6QodtbUPTg&gclsrc=ds (we also let them out to free range in the yard during the day most days or put them in a protected tractor to get some grass/dirt/bugs etc.) Attached to this coop I have built a run that is 4 feet tall chicken wire with a waterproof slanted roof. The roof is closed in on both ends of the run but the rest is just wire. The chickens roost at night under the roof in the run. The go in the coop to use the nest boxes occasionally, sometimes they lay in the run, but there arent any roosts in the coop. Are my chickens smart enough to go to the inside part of the coop when it gets cold at night or will they stay on the roosts in the run despite the cold? Will it be warm enough as is or do I need to close off a couple sides? If I add roosts to the inside of the coop, will they use them if they are lower than the roosts in the run? This is obviously our first winter with chickens our first chickens in general and we dont want to loose our girls! Thank you all for any input!