With rapid urbanization and economic growth, great changes have taken place in China, resulting in new challenges for energy-efficient, low-carbon buildings. On March 31, 2008, the China Green Building Council was established in Beijing. After that, green building standards, an evaluation index system, and policies were developed. In 2012, 389 projects with total floor space of 41 million m2 were labeled as green buildings, using China’s green building rating system. Thermal comfort is one of the key factors in building energy use. In Chongqing, the absence of centralized district heating makes building indoor temperature often fall below 15 oC in winter; in summer, indoor temperature often exceeds 29 oC. Indoor thermal environment greatly affects building energy use. Collaborative research has been conducted to develop a Chinese standard of acceptable indoor thermal environment.