Manufacturing and sales of refrigeration and air conditioning equipment: Manufacturing of household appliances; Sales of household appliances, manufacturing of non-electric household appliances, sales of non-electric household appliances: Manufacturing of gas and liquid separation and purification equipment, sales of gas and liquid separation and pure cooling equipment, sales of photovoltaic equipment and components, sales of solar thermal utilization equipment; Household appliance installation services: Installation services for general mechanical equipment; General equipment repair Energy performance contracting, technical services, technical development, technical consultation, technical exchange, technical transfer, and technical factory promotion, import and export of goods: Technology import and export (except for projects that must be approved by law, independently carry out business activities not prohibited or restricted by laws and regulations). Licensed projects: Installation and maintenance of gas-burning appliances