I have peachicks 2 1/2 months old. It's suppose to get down to freezing tonight. Will they be ok without heat? They are in a 4' by 6' wire cage 6' high out of the wind and moisture. I have it covered/wrapped with plastic and tarp leaving it open at the front for ventilation. I'm assuming the chicks that are 4 1/2 months old will be ok?????? They are in a pen 10' by 30', 9' high which includes 10' at the end having a shed roof and walls on 3 sides. They are out of the wind. Thanks much.