Most ceiling fans have a reverse switch, and using it seasonally can improve comfort and save energy.
In summer, set blades to spin counterclockwise when viewed from below. This pushes air downward, creating a wind-chill effect that makes the room feel cooler.
In winter, switch to clockwise at a low speed. This gently pulls cool air up and pushes warm air near the ceiling down along the walls without creating a draft.
Remember that fans cool people, not rooms. Turn them off when leaving the room to save energy.