中国是一个发展中大国，又是一个建筑大国，每年新建房屋面积高达17-18亿平方米，过所有发达国家每年建成建筑面积的总和。随着全面建设小康社会的逐步推进，建设事业迅猛发展，建筑能耗迅速增长。所谓建筑能耗指建筑使用能耗，包括采暖、空调、热水供应、照明、炊事、家用电器、电梯等方面的能耗。其中采暖、空调能耗约占60%~70%。中国既有的近400亿平方米建筑，仅有1%为节能建筑，其余无论从建筑围护结构还是采暖空调系统来衡量，均属于高耗能建筑。

China is not only a developing country, but also a building country. The area of newly built houses reaches 1.7-1.8 billion square meters every year, which is more than the sum of the built areas of all developed countries every year. With the gradual progress of building a well-off society in an all-round way, the construction industry develops rapidly, and the building energy consumption increases rapidly. The so-called building energy consumption refers to the energy consumption of building use, including the energy consumption of heating, air conditioning, hot water supply, lighting, cooking, household appliances, elevators, etc. The energy consumption of heating and air conditioning accounts for about 60% ~ 70%. only 1% of the existing 40 billion square meters of buildings in China are energy-saving. The rest are high energy consumption buildings, whether measured by building envelope or heating and air conditioning system.