These systems are sometimes referred to as Air To Water Heat Pumps. At the System level of the Building Tree, create a new Central System in the library. The system type should be set to Hydronic Heat Pump. Enter the Heating Capacity and COP in the Heating Tab, and the Cooling Capacity and EER in the Cooling Tab.
We have an example of this system in the ResAirToWaterHP.bld example file.
If you wish to make this a ground coupled system (geothermal), at the Plant level of the Building Tree, Hydronic tab, check the box for Ground Coupled.
If the Heat Pump also supplies the Domestic Hot Water, at the Plant level of the Building Tree, Domestic Hot Water tab, create a Heat Pump Water Heater with the COP entered for the Energy Factor.
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