Chickens in cold condition

[Chickens4life13]

I have only 2 chicken a hen and a rooster . It's getting really cold and it is the first time I have had chickens and it is really cold. Any tips to keep them warm apart from a lamp. They are 4 and a half months old

 

[Eggcessive]

Where do you live? Chickens do not usually need any heat source after they are fully feathered. They do need a coop with good overhead ventilation while preventing direct wind to blow on them. People raise chickens in Alaska, Canada, Minnesota, and Maine without heat in coops. A heated dog bowl to keep water from freezing is a good idea.