Born on the "icy" Northen Italy (Trento) and live in Brazil. No air conditioning here.
When hot comes (last week it goes 28ºC... on winter... now, use your imagination about the hot days) I use ancient Native American tropical knowledge and play with no clothes (no clothes AT ALL), a small (but strong) fan right under my chair, pointed to my legs (that is also useful to keep mosquitoes away), a bigger fan right at my side, pushing air into PC's cabinet, about 2 or 3 iced 650ml water bottles over one ot two hours session, a lot of sweat and a head full of happy thoughts.
Can you imagine what is to race on a Brazilian race track at summer?