Energy efficiency depends on the type of materials used. Traditionally, sunrooms and patio enclosures are built to maximize sun exposure in the room, which warms the space. In the wintertime, because these same rooms are not well insulated, they can lose heat. Energy efficiency can also be increased with the type of windows installed. Double-glazed windows are more energy efficient than single-glazed windows. For flooring, brick can help absorb and hold the sunlight to help heat the home during the cooler winter months.