... 4.5 COP, R410a 4. CE approved Ground source heat pumpCooling capacity: 37532BUT/h ~716520BUT/hCOP: 3 ... Automatic constant temperature adjustment. 9.Integrated design, multi-protect and reliableIntegration design, system sealed welding completely ... refrigerant 410A, no damage, environment friendly. 11.Multi-source designAir source , ground source, solar and electric auxiliary heat integrated together ...