Shanghai Yiyuan Construction Engineering Co., Ltd. is a private limited liability company registered on March 9, 2010. It is a professional company specializing in the design and installation of central air conditioning engineering, ventilation engineering design and installation, central air conditioning equipment and refrigeration equipment maintenance. The company's main business involves central air conditioning, ventilation, refrigeration, floor heating, water supply and drainage, kitchen equipment, environmental protection, intelligence, electrical and mechanical installation and maintenance services for shopping malls, hotels, office buildings, factories, villas and other types of construction projects.