The four seasons song group has modern manufacturing bases in the provinces of jiangsu, henan, zhejiang, guangdong and hebei. It has the enterprise technology centre and postdoctoral research stations. Chinese brands worth more than 500, and the global new energy 500 list, which has been awarded for 13 consecutive years as "the nation's ten-best after-sales service" and 12 consecutive years as the best employer in china. Clients are located in 31 autonomous provinces and municipalities, over 2,000 counties and more than 100 countries, including germany and the united states. Over 18 million user databases have been deposited, bringing together over 20,000 service networks and continuously improving and upgrading comfortable hot water heating experiences. In 2012, the first air power production base in the four seasons of the song, with an investment of 545 million, was built in sundh, guangdong, with a large integrated air power testing centre with an annual capacity of 1 million units. In 2021, 500 million people were invested in the construction of an intelligent air power plant that combines r & d, production and testing, promoting forward technology development and intelligent manufacturing of air energy, with an annual production capacity of up to 700,000 units and two bases, north and south, to support and promote the goal of a four-season chorus of air capacity of 10 billion. Enterprises focus on clean energy heating and hot water, which covers solar energy, air energy, water purification machines, electric water heaters, gas heaters, integrated water heaters, hardware baths, smart homes, kitchen appliances, wall-mounted stoves and other whole series of hot water and heating products, and have developed solutions from single machines to systems, from urban to rural, from home to commercial, from sub-linee to line-based hot water and heating systems。