The coal to air source heat pump project of Fangshan Rural Commercial Bank System involves more than ten sub-branches and supporting family buildings, including Fangshan Qinglonghu Sub-branch, Fangshan Yancun Sub-branch and Daxing'an Sub-branch. In order to solve the current situation that the traditional coal-fired boiler heating method is seriously polluted and the heating effect is not good, the system selects the Kcalin air source heat pump as the heat source module to bring efficient, energy-saving, safe, clean, warm and comfortable heating experience for the bank staff and their families. The project was completed and officially put into use in November 2018.