I'm in Minnesota - need I say more about temperature challenges. Last winter I had four banties. Our coop has only insulation in the roof, we did deep bedding (6-8 in) last winter & also a heated pet bowl for water. the birds did well - we did have frost bite on the roo's combs, I learned about vaseline on combs & waddles. I now have 23 golden laced wyandottes with rose combs, supposed to be cold resistant. The word I have heard is to keep them out of the wind, cold isn't as big of a concern. Of course, good ventilation, fresh water and we do give them warm mash made with their feed, apple sauce, lettuce, grapes, yogurt & of course some warm water. They pick the grapes & purple lettuce first & then the rest. So far, they have continued to lay - 12 eggs today. Last winter, we did have trouble with bantie eggs freezing because the hens wouldn't lay on eggs. These are different tho - however, my broodie doesn't seem to be broody any more. so we will see if we can keep the eggs from freezing. I don't want to "heat" however, we did use a red heat lamp when it was zero or below last year. Much to learn!! but I love my girls!