Need. Installing air conditioners requires the qualification certificate of Room Air Conditioner Installation Operator Certificate issued by the Municipal Quality Supervision Bureau, namely, business license, organization code certificate, tax registration certificate and account opening permit. Zhuhai Gree Electric Co., Ltd., founded in 199 1, is an international household appliance enterprise integrating R&D, production, sales and service, with three brands of Gree, TOSOT and Jinghong, and mainly engaged in household air conditioners, central air conditioners, air energy water heaters, mobile phones, household appliances, refrigerators and other products.