Another unlikely helper for chilly rooms may already be mounted to your ceiling—the overhead fan. Set to run in reverse, it can be as much help spreading heat in the winter as it is in cooling the space off in high summer. Simply flip the switch on the motor housing, so the the blades spin clockwise, then set the fan to low. Because warm air rises, the spinning blades gently nudge heat down toward the chilly areas below. Strategically placed, a ceiling fan even works to draw heat into a cold room from a toastier space—say, an adjacent room with a fireplace or space heater.