Passive solar design uses heat from the sun to light and power homes in order to minimize or completely replace the use of electrical devices. Homes and buildings that use passive solar design typically make use of large windows and skylights to maximize use of natural light. Open floor plans facilitate better cross ventilation during warm days. A passive solar building is also well-insulated to make the most use of the sun’s energy — resulting in interior spaces that are quiet and free of drafts and cold spots.