Generally, full-grown chickens do not need a heat lamp. They are able to regulate their own body temperature and stay warm in most environments.
However, there are some exceptions to this rule:
- Cold climates: Chickens in very cold climates might benefit from a heat lamp during the coldest months of the year, especially if they are not housed in a well-insulated coop.
- Young chicks: While not full-grown chickens, it's important to note that baby chicks do need a heat lamp to keep them warm until they are old enough to regulate their own body temperature.
- Sick or injured chickens: If a chicken is sick or injured, it may need a heat lamp to help it stay warm and recover.
Ultimately, whether or not a full-grown chicken needs a heat lamp depends on the individual chicken's needs and the environment it lives in.