I am in northern WI and we have had snow and -0 temps for quite a while- -20 last night. My young hens will not go out in the snow and cold. They are content to stay in the coop( insulated and inside a garage) all day and night. They are laying and eating well and moving around between the roosts and the nesting boxes. I keep adding wood chips every couple of days and have a heater for their water as well as light on a timer. Should I be forcing them out or can they wait for better weather?