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Welcome to BYC !! Where are you located in NC? My husband is from NC and we lived in Wilmington, NC until we moved to VA.
We live in Southern Virginia and we have really hot and humid summers here, too. Our Orpingtons handle it pretty well. Ours have plenty of shade and we have fans hung up in the corner of each coop to help circulate some air. Make sure that they have plenty of fresh, cool, clean water. I change our waterers twice a day in the summer months. I also save the plastic Gatorade bottles and fill them with water and freeze them. I put these frozen bottles inside the waterers to help keep the water cool and I change these out 3 times a day - sometimes 4 times on really hot days. A lot of people mist their birds and I'm going to try that this summer.
Hope this helps. There are a couple more Orpington threads - you should check those out.