Ok, this does not pretain to chickens very much, but I have a little mallard sub-breed and he has a very runny nose, and is cold out there at night. If it helps with the finding out the temp. I live in Harker Heights TX. I also have 2 Campbells out there and there just fine in the cold. Pato (the duck) has been raised w/ chickens and im considering putting him in there w/ them, they get along fine. I just dont want him to freeze out there. Any other suggestions will help.