Gree Electric Appliances Inc. of Zhuhai, the world’s largest specialized air conditioning manufacturer, was founded in 1991 and is headquartered in Zhuhai, China. As a global leader in the air conditioning industry, Gree integrates R&D, manufacturing, sales, and service under one roof. Guided by its business philosophy of "Master of Core Technology" and its long-term vision to "Build a Century-Old Enterprise," Gree has established itself as an industry pioneer. The company is renowned for its exceptional product quality, cutting-edge technology, and innovative sales strategies.

Zhejiang Dun'an Artificial Environment Equipment Co., Ltd. is a listed company specializing in the production of air conditioner refrigeration accessories and electric refrigeration central air conditioner host and terminal equipment. The central air conditioners produced are famous brands in Zhejiang Province. Based on the principle of "high starting point, high quality and high standards", we have introduced and developed world-class equipment and technology, and carried out extensive cooperation with domestic and foreign universities and scientific research institutions, comprehensively developed and applied high-tech technologies such as intelligent control, energy saving, environmental protection, and network remote control functions, and created an artificial environment business with international competitiveness.

Haojin Oubo Technology Co., Ltd. is a national high-tech enterprise integrating R&D, production, sales and service of large-scale purification central air conditioners. Oubo has always adhered to technological innovation. As a member of China's "Refrigeration Standards Committee", it has participated in the formulation of many national and industry standards and has many invention patents and utility model patents. Oubo currently has more than 1,000 models of independently developed high-quality air-conditioning products. The products have obtained energy-saving certification, CRAA, EU CE certification, US AHRI certification and other authoritative certifications. They are widely used in hospitals, purification workshops, pharmaceutical factories, electronics, tobacco, coating and other industries, and have the industry reputation of "King of Cleanliness" and "King of Constant Temperature and Humidity Non-standard". Oubo has always insisted on improving product quality and services through technological innovation, and has contributed to mankind, improved the quality of human life, and promoted human life to be more comfortable, easier and better.