I have 2 buff Orpingtons and a Welsummer. Last summer (in the 90s) I watched as my fluffiest (OK fat) BO “fainted” and rolled down hill. I got her up and put her in the shade with a fan, but I would say Orpingtons are not particularly heat tolerant. All 3 girls did OK in the cold snap we just had though. I live in Atlanta.Jersey Giants & Orpingtons are some of the friendliest breeds that have straight combs to help with heat. Not sure how hot they can deal with, hopefully someone will chime in!