Good morning all! I am a first time chicken owner and I have some questions about keeping my hens healthy in the sub zero temperature. I only have three hens so their her house is only about 5ftx4ft I only have one heat lamp in there and they have free access to their run. Is one lamp enough? Should I put a thermometer in their house? I almost think they are getting too hot! They prefer to be outside in the cold than in the heated house. I know chickens over heat but I'm scared they ate going to freeze to death. I also see a lot of people say they changed the chicken feed during the winter. Why is that and what should I change it to? I have one runt in the family and she spends almost all of her time in the house and has never laid an egg... I'm worried about her this winter :/ any suggestions would be appreciated!