Don't underestimate the humble fan. In low humidity, a strategically placed fan can make you considerably more comfortable. On the sunny side of the house, particularly on upper floors, position fans to blow out toward an open window. On the shady side of the house, particularly on lower floors, do the opposite—orient fans to blow in toward the living spaces. In the summer, set ceiling fans to rotate counterclockwise so cool air gets drawn up from the floor.