Zhejiang Dun`An Artificial Environmental. 

Zhejiang Dun'an Artificial Environment Co., Ltd engages in the research and development, production, and sale of refrigeration components, refrigeration and air-conditioning equipment, and automotive thermal management systems in China and internationally. The company offers refrigeration accessories, including electronic expansion valves, four-way valves, globe valves, solenoid valves, small pressure vessels, heat exchangers, integrated pipeline components, and other products, which are used in household air conditioners, commercial air conditioners, and other fields. It also provides commercial chiller, air-conditioning terminal, nuclear power, rail transit, communication, cold chain, and other special air-conditioning system products that are used in commercial buildings, nuclear power plants, rail transit, and other industries, as well as thermal management systems for new energy vehicles. The company was founded in 1987 and is headquartered in Hangzhou, China.