Air source heat pumps have external fan units which sit outside the property.
Dependent on heat pump design, the heat pump unit has a heat exchanger to capture energy directly from the air. This ambient heat energy from the environment can then be piped via a low temperature water and glycol mixture into the property where it is compressed to form higher temperatures.
Click on the video below for a full explanation of the Mitsubishi Ecodan air source heat pump:
