The main business of Shanghai Yiyuan Construction Engineering Co., Ltd. involves central air-conditioning installation, ventilation, refrigeration, floor heating, water supply and drainage, kitchen equipment, environmental protection, intelligent, electrical and mechanical installation of shopping malls, hotels, office buildings, factories, villas and other types of construction projects. And air-conditioning maintenance service. The company pays attention to the management concept of "quality" and "efficiency". For many years, the company has been operating well, without quality failure or safety accidents, and it has been well received by many customers.