You can enjoy cool basement air in the upper stories of your house with the smart placement of fans. Get started by shutting all windows except for one window on the top floor in the farthest possible south-facing corner. Position a box fan in the opened window, facing out. Next, open a basement window in the farthest north-facing corner. The open basement window allows cooler air in while the upper open window pulls warm air out. Don't forget to keep the interior door to your basement open. To boost the effect, consider installing a ceiling fan near your basement entrance to promote circulation of basement air into the rest of the house.