I have chickens that ( if let outside) come directly inside the coop almost before dark. ( without training). I have two Buff Orpingtons, two Easter Eggers, two Speckled Sussexs, and three Barred Rocks. Every one lays 5 eggs a week. For more info about chickens go to this website...
Hi this page tells you about Cochin chickens...http://www.mypetchicken.com/chicken-breeds/Cochin-B30.aspx
We live up north and our chickens are a year old too, I'd get a heat lamp and a water heater. They'll be fine.