Patio awnings, as well as those on porches and decks, make it possible to eat a meal outdoors or sit in the shade where there would normally be none.

• 此外，美国能源部下属的劳伦斯伯克利实验室也对住宅节能技术进行了重点研究，并和一些州政府合作建设“节能样板房”予以示范。