In summer, a ceiling fan adds a welcome, cooling breeze--but did you know your fan can help you stay warm in winter, too? Most modern fans include a reverse setting to draw cold air upward and redistribute warmer air downward around the edges of the room in cold weather. How to tell the difference? Look up! In summer, you'll want the fan's blades to run counter-clockwise for cooling; in winter, blades move clockwise to draw cold air upward.