A canopy is an overhead roof that is constructed to give shade and shelter.It protects the building from the natural elements and helps in keeping the home cool.

• 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。