This includes an area of 1,800,000 km2 (694,984 sq mi) with a population of 550 million people, and it is the most populous and economically-developed area of China, producing 48% of the gross domestic product (GDP) of the whole country.
For historical reasons, the residential buildings in this zone don’t have central HVAC systems and are not well insulated or otherwise weatherized.
With the recent and rapid economic development of this region, demand for better indoor environments is rising.
The Chinese government has created new national design standards and other efforts to lower the energy consumption while also constructing new power generating stations.
1.Design Standard for Energy Efficiency of Residential Buildings in Hot Summer and Cold Winter Zone JCJ 134—2001