Heat pumps are considered to be particularly climate-friendly, as they obtain "around three-quarters of the energy for heating from the environment" Heat pumps for space heating and water heating have become a heating option that is as reliable as it is environmentally friendly. Underfloor or wall heating systems in particular can be used well in combination with the heat pump for heating.
Heat pump technology dates back to the 19th century, the first major heat pump systems for heating buildings went into operation in Zurich in 1969.