At 0°F: any breed on this page, in a dry and draft-free coop, is fine without supplemental heat. Expect eggs to slow, feed intake to climb — they burn calories making heat, so keep the feeder full and consider an evening scratch feed — and birds that mostly stay in, roosting fluffed over their feet. That's normal, not suffering.
Wind chill is a coop-placement issue, not a chicken issue. Wind only bites where it reaches the bird. Site the coop out of the prevailing northwest wind, keep roosts away from vents and cracks that stream air across them, and give the run a windbreak on the windward side. On a calm, sunny 10°F day your hens will come out and dust-bathe in a snow-free patch; on a windy one they'll vote with their feet and stay in. Let them.
In a deep snap (−10°F to −25°F): this is where the care notes above earn their keep — dry bedding, ventilation without drafts, unfrozen water, and a morning comb check. Pale, waxy comb tips are early frostbite; blackened tips are late. It usually heals, but it's nearly always a moisture story, not a temperature one.
The fall-pullet shortcut: a started pullet bought in fall arrives at 16 weeks — fully feathered, coop-ready, no brooder, no heat lamp in your garage in November. She settles in before deep winter, and she reaches laying age right as the days start lengthening, so she comes into lay as winter ends. A chick hatched in spring, by comparison, won't lay until late summer. If eggs next spring are the goal and you'd rather not winter babies, fall pullets at $27.00 are the honest shortcut.