How to buy central air conditioning, central air conditioning classification, composition, air duct unit science and technology

Air conditioning system was first invented by Willis Carrier, the founder of the Carrier Corporation, the technology gradually spread in the Americas as well as Europe, the early American companies are mainly based on the development of water as the refrigerant air conditioning system. Then Japan also followed, designed to Freon as the refrigerant of the central air conditioning system, and in the international market has achieved a lot of share. With the increase in domestic demand for central air conditioning, some of China's air conditioning manufacturers have also accelerated the research and development in the field of central air conditioning, designed a number of central air conditioning products with independent intellectual property rights.