Hello All! I have three Welsummers that I got as chicks in March. Their run is wire-enclosed and their hen house is raised but as the temperatures drop they continue to sleep on the open air roost. Do I let them navigate their own sleeping location or should I close them up at night in the hen house. FYI, I plan to cover the wired run with plastic but refuse to add heat. Their hen house is not insulated either but I did add more straw as deep litter. I would like them to acclimate to the cold on their own but I can't help but worry about them. Thank you!