I'm not sure how old they are so, as long as they are fully feathered, they will be fine. Provide a wind break for them so that they can avoid drafts but still make sure there is adequate ventilation. I'm in N Alabama, near Huntsville and this new to the area so this will be my first time dealing with cold temps (moved from FL). Today I went out and covered some of their windows with old feed bags and added some hay for the geese and younger chickens to sleep in. I'm going to be purchasing more hay to use as windbreaks so I'm hoping to find a good deal on bales but may have to get a 4x5' roll and then I will just make bundles of it to provide more insulation from wind. They should be fine regardless in Atlanta considering people keep ducks, chickens, etc in Canada and Alaska just with more structured housing.