Yes, we have 24 chickens - 23 18-week-old pullets and one gorgeous yet wimpy rooster. Our hen house is 10 x 12 x 8 and we have two 250-watt infrared heat lamps over the roosts. It helps a lot, keeps their combs and wattles from frostbite, and they are more comfortable. We live in NH, and it gets cold here...and snowy. Right now, it's about 10 degrees and it feels like -10 because of the wind.
All of ours are heavy breeds - but it doesn't hurt to try and minimize their discomfort. They are pretty young but four started to lay two weeks ago. 16 weeks at the start - and if we didn't give them some warmth at night and minimal light, they may not have started at all.
I know heavy breed birds can withstand the cold and are indeed bred for that; but you know - pilgrims on the Mayflower survived the first winter (at least, those that did survive) wearing layers of clothing and living in homes heated only with wood. Temps in their homes averaged 50 degrees or so - and they could survive that but when it was possible for them to be more comfortable - warmer - didn't they take advantage of that?
Don't believe all you read about Nanook of the North.