Heinyu, dedicated to innovation and practice in the field of central air conditioning. Founded in 1999, Qingdao Heinyu Environmental Protection Air Conditioning Equipment Co., Ltd., is one of the manufacturers of a full range of central air conditioning equipment with the longest production history in northern China. It specializes in the R&D and production of central air conditioning equipment. The company has grown into a high-tech enterprise integrating R&D, design, manufacturing, installation, commissioning, sales, and maintenance. It owns central air conditioning brands HEINYU, 海大韦尔, and HITAWIR, with products distributed throughout China and exported to over 40 countries and regions globally. At the same time, we provide OEM/ODM services for many well-known enterprises at home and abroad. Heinyu’s central air conditioning product line is comprehensive, including air source heat pump units, screw-type air-cooled chiller (heat pump) units, water (ground) source heat pump units, sewage source heat pump units, seawater source heat pump units, water-cooled chiller units, constant temperature and humidity units, heat pump drying units, combined air conditioning units, rooftop air conditioning units, air handling units, remote jet machines, fan coil units, etc. Among these, the seawater aquaculture heat pump unit has been awarded a national invention patent. Heinyu central air conditioners are widely used in factories, schools, hotels, hospitals, office buildings, shopping malls, residential communities, and other buildings. Heinyu has established a nationally certified standard air conditioning unit performance testing center. It has obtained the CRAA Product Certification and the China Energy Saving Product Certification. The company has passed ISO9001 Quality Management System Certification, ISO45001 Occupational Health and Safety Management System Certification, and ISO14001 Environmental Management System Certification. Heinyu is recognized as a "Specialized, Fined, Peculiar and Innovative" small and medium enterprise, a high-tech enterprise, and a provincial famous-brand product enterprise. It owns four national invention patents and twenty-five utility model patents. The company is committed to survival on the basis of product quality and development through technological innovation, continuously researching and producing green, clean, environmentally friendly, and energy-saving innovative products. With full enthusiasm for work, Heinyu is dedicated to exploring and innovating, striving for excellence, raising standards, and acting decisively to continually create more value for customers.