We have had a couple of calls lately that featured heat lamps in chicken coops. No one wants to see our livestock suffer during the winter months, but consider carefully how to warm your outbuildings, as well as if you should at all. The following article may help.
https://www.acreagelife.com/hobby-farming/to-heat-or-not-to-heat-the-question-is-not-about-comfort-but-safety