I'm a new member and new to chickens. And I've run into my first problem. When I got my two chickens, they were about three months old. I have an old chicken tractor with two nesting boxes. I kept them in it for a week and then let them out during the day. At first they very willingly went back into the chicken tractor at night, roosting on top of the nesting boxes. But all of a sudden one night they don't want to go back into the coop for reasons that are unclear. And nothing I've tried for luring them in has worked so far. They seem to have found an alternate evening roost on the window airconditioning unit of my studio (which only runs during the day when I'm using the space.) We're in the process of building a new coop. I'm looking for suggestions on how to get them to use it once it is finished. And perhaps to lure them back into the chicken tractor in the meantime.