Cool Off

“Curved roofs aid airflow for natural ventilation,” architect Nathan Kipnis says of his 2,600-square-foot design. He improved on this model by adding a tower between the double-height living area and the two-story bedroom wing. Opening the windows on the lower level draws cool air up the center tower to the second-floor bedrooms, forcing warm air up and out through remote-controlled windows. Ceiling fans expedite the process.