As an architectural projection, it enhances the look of a building.A canopy can also be constructed near the building and stand alone and can be made of fabric.This is called a cabana or a gazebo.

• 有些州还用财政补贴方式支持节能效率高的住宅建筑 美国在住房建筑节能方面由政府机构做好服务工作，并充分运用市场工具，让公众感受到节能对自身的好处，从而自己作出选择，这种做法是值得借鉴的。