Btw, heating the coop doesn’t allow them to develop their natural winter down jackets so, no, they won’t like it outside. If you have a storm and lose power you will probably lose birds due to freezing. Insulation and heat are not good for them. Let them be chickens, not humans. Humans wear down jackets. Chickens grow them.
The heat lamp is also a danger of fire. There are tons of stories on this site about heat lamps burning down coops and sometimes spreading to homes and other buildings. Chickens flap n try to fly so the can knock down the lamp. Dust, feathers, wood shavings, straw, all gets flying around the coop when they fly around or tussle for the best roost space. This lands on the lamp and can spark off a fire.
The heat lamp is also a danger of fire. There are tons of stories on this site about heat lamps burning down coops and sometimes spreading to homes and other buildings. Chickens flap n try to fly so the can knock down the lamp. Dust, feathers, wood shavings, straw, all gets flying around the coop when they fly around or tussle for the best roost space. This lands on the lamp and can spark off a fire.