Now is the time to think about efficient ways to keep your home cool in the hot and humid summer months. For rooms that are not air conditioned, invest in window screens that fit snugly in place. At night, open the windows to take advantage of the naturally cool night air and flush out the hot, stale air. Close the windows during the day. Take the time to examine vents throughout the home: If drapes, furniture or rugs are blocking floor vents, move them now so the airflow can be unobstructed.