Sinopec Hebei branch gas stations are spread all over in Hebei. In this project 90 stations are added. The air conditioning employed rooms are mainly halls and offices with an air conditioning area from 200㎡to 500㎡. At each gas station a Meiyi water-water type ground source heat pump unit is used including 54 units of MSR-J120WLD and 36 units of MSR-J086WLD. The cold and heat source adopts the ground source heat pump system, which extracts heat from the ground loop in winter and discharge heat to the ground loop in summer.