Heat pumps move heat energy from one place to another. That's it, that's all they do (hence the name "pump").

The heat pump in your refrigerator moves the heat from the inside of the insulated box and releases it into the room. The heat pump in window air conditioner takes the heat out of a room and vents it to the outside. A ground source heat pump can remove heat from the ground and release it into a structure or it can remove heat from a structure and release it into the ground.

The efficiency of this heat transfer greatly depends on the load and the source temperatures.