I am modelling a VRF system for a typical office building in Hong Kong.
The result shows high COP compared to specified COP.

in HVACTemplate:System:VRF, Gross Rated Cooling COP is set to 3.68 as shown in below image. However, the result COP sometimes reach to 6 which is much higher than specified value.

I am assuming that this is caused by default performance curve prepared by EnergyPlus.
Can anyone come up any other possibility causing this high COP situation?