Air source heat pump is an energy-saving product that transfers heat energy from low temperature area to high temperature area. As the name suggests, an air source heat pump absorbs heat energy in the air, transfers heat from the outdoor air to the interior in winter, and transfers the heat from the interior to the outdoors in summer. Its cooling and heating principle follows the Carnot cycle. It consists of evaporator, compressor, condenser, throttle valve and other parts.