I bought a small 3-level town home (basement, level 1 and level 2), with central AC. The basement is pretty cool these days even without AC. The top floor is kinda warm even with AC on. I heard that hot hair goes up and cold air goes down, and this has to be the cause. Just wonder if any of you guys out there has any good tip to cool down the top floor. Does it help to set up a powerful fan on the top floor to force the air circulate across all 3 levels? Please give me your tips, thanks.