Wärmepumpen
Wärmepumpen are devices that transfer thermal energy from a heat source, such as the ambient air, ground, or water, to a heat sink, typically a building's heating system. They operate on the principle of refrigeration, using a refrigerant cycle to absorb heat at a low temperature and release it at a higher temperature. This process is the reverse of how a refrigerator works, which removes heat from its interior and releases it into the room.
The energy source for a Wärmepumpe can be renewable, making them an environmentally friendly option for heating
Wärmepumpen can provide both heating and cooling. In heating mode, they absorb heat from the external source