Weifang Rongjun Garden Community Clean Energy Heating Reconstruction Project is located in Weifang City, Shandong Province, with a heating area of about 26000 square meters. It is divided into three residential buildings, including 1 #, 2 # and 3 # buildings, all of which use Kcalin STS air source heat pump as heat source equipment.A total of 8 KLKQ-STS/S-90/24 (I) R3 Kcalin STS commercial low-temperature air-source heat pump module units are used in the system, and the end equipment uses floor heating to replace the traditional heating mode. The function setting of converting low grade energy in the air into high grade energy by using a small amount of electric energy can provide residents with a clean, environment-friendly, comfortable, energy-saving, continuous and stable winter heating experience. The low area project of the project has been completed and officially put into use in November 2020.