My parents keep their house in the 80's during the summer, and then complain all summer about how they don't feel well. Todd won't even stay there during the summer, and it makes me feel bad as well. I'm not sure it's the actual temperature, though, but rather the temperature differential. If you're used to one temp, then go someplace with a drastically different temp (like walking outside to a heavily air conditioned meeting or changing your 70-something house to 80-something and back each day)it's going to throw your system for a loop.