In 1992, Zhang Yue and his brother founded Yuanda Air Conditioning Co., Ltd. in Hunan. In 1996, Yuanda's direct-fired air conditioner technology reached the world's leading level, and its production and sales volume ranked first in the world. At present, Yuanda has developed into one of the world's largest direct-fired air conditioner manufacturers. In 1997, Zhang Yue became the first private entrepreneur in China to own a business jet. Yuanda has always been a model for private enterprises in terms of environmental protection and taxation. In terms of scale, it is not the largest, but its tax payment was once ranked first among private enterprises in the country. Its environmental protection cases have been included in the "United Nations Global Plan".