China Package Type Cross Flow Open Circuit Cooling Tower manufacturers Our History Hunan Yuanheng Technology Co., Ltd. was established in 2005 and is headquartered in Changsha City, Hunan. Yuanheng is a professional enterprise integrating R&D, production, sales and service of cooling tower and central air-conditioning, with advanced technology and outstanding performance in energy-saving, water-saving cooling towers, energy-saving central air-conditioning heat pump, building energy-saving services and other fields. http://www.yhcooling.com/