They'd do fine without heat, although originally from Africa - these are far from their original ancestors. Chickens originate from Jungle Fowl in the Philippines, but do well in cold climates.
Be wary of using heat for them, if you ever lose electricity & do not have a generator, the lack of heat can kill them since they are adjusted to having it. I have a large mixed flock of chickens/ducks/geese & they get nothing in their coop. We overwinter them by wrapping the coop in plastic to avoid drafts & they do fine.
Also be wary of a heat lamp for fire reasons. They make infrared panels you can use for heating that are less of a fire hazard. My friend lost her entire house when he coop caught fire from a heat lamp.
Be wary of using heat for them, if you ever lose electricity & do not have a generator, the lack of heat can kill them since they are adjusted to having it. I have a large mixed flock of chickens/ducks/geese & they get nothing in their coop. We overwinter them by wrapping the coop in plastic to avoid drafts & they do fine.
Also be wary of a heat lamp for fire reasons. They make infrared panels you can use for heating that are less of a fire hazard. My friend lost her entire house when he coop caught fire from a heat lamp.