I really do better in cooler weather, too. The past 2 summers I feel I acclimated myself to riding in 80+ temperatures a little better, but I still feel not that great. I get hot no matter what I do. I am always either over heated or chilled when I x country ski. Riding in Spain was torture for me, as it was about 98 for the first 5 days of the 8 day tour. I hated living in Miami, but I didn't exercise then. I never went outside in Phoenix, when it was 112, except to run into the pool in my backyard and sit in the pool, on the steps, or on a float in the pool. All my exercising was done in a gym; when the nice weather came, I would walk once in awhile, but generally never went outside!