Europe is largely un-air conditioned. It hasn't been a big problem... we had a mild summer in Berlin and London is mild by nature, but Paris has been hot. Nigh unto down right miserable. We're talking close to 30° C every day (thats around 85° F for all your non-metric gurus out there) and humid, and the evenings stay very warm. I think it goes without saying that we are so anxious to get back to our nice, centrally air conditioned apartment.