Method for operating a climate control system for a vehicle, wherein the climate control system comprises: - a heat pump having an outside air heat exchanger; and - a further heating source for an interior of the vehicle; wherein the method comprises the following steps: - determining a heating power requirement for the climate control of the vehicle; - determining a required thermal power input at the outside air heat exchanger; - determining an outside air condition; - determining a fluid temperature in the outside air heat exchanger that is necessary for the required thermal power input; - determining whether the outside air at the outside air heat exchanger falls below a dew point at the necessary fluid temperature; and then - selecting an operating strategy for the climate control system on the basis of criteria which include at least meeting the heating power requirement, the outside air temperature and an overall energy efficiency of the climate control system, by means of a control unit of the vehicle from a group which includes at least the following operating strategies: b) meeting part of the heating power requirement by operating the heat pump at a fluid temperature which does not fall below the dew point, and meeting the rest of the heating power requirement by operating the further heating source; c) temporarily meeting part of the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, and meeting the rest of the heating power requirement by operating the further heating source, followed by a thawing phase of the outside air heat exchanger; d) temporarily meeting the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, followed by a thawing phase of the outside air heat exchanger; - wherein the operating strategy having the greatest overall energy efficiency that meets the heating power requirement is selected. - a heat pump having an outside air heat exchanger; and - a further heating source for an interior of the vehicle; wherein - determining a heating power requirement for the climate control of the vehicle; - determining a required thermal power input at the outside air heat exchanger; - determining an outside air condition; - determining a fluid temperature in the outside air heat exchanger that is necessary for the required thermal power input; - determining whether the outside air at the outside air heat exchanger falls below a dew point at the necessary fluid temperature; and then - selecting an operating strategy for the climate control system on the basis of criteria which include at least meeting the heating power requirement, the outside air temperature and an overall energy efficiency of the climate control system, by means of a control unit of the vehicle from a group which includes at least the following operating strategies: b) meeting part of the heating power requirement by operating the heat pump at a fluid temperature which does not fall below the dew point, and meeting the rest of the heating power requirement by operating the further heating source; c) temporarily meeting part of the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, and meeting the rest of the heating power requirement by operating the further heating source, followed by a thawing phase of the outside air heat exchanger; d) temporarily meeting the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, followed by a thawing phase of the outside air heat exchanger; b) meeting part of the heating power requirement by operating the heat pump at a fluid temperature which does not fall below the dew point, and meeting the rest of the heating power requirement by operating the further heating source; c) temporarily meeting part of the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, and meeting the rest of the heating power requirement by operating the further heating source, followed by a thawing phase of the outside air heat exchanger; d) temporarily meeting the heating power requirement by operating the heat pump at a fluid temperature which falls below the dew point, followed by a thawing phase of the outside air heat exchanger; - wherein the operating strategy having the greatest overall energy efficiency that meets the heating power requirement is selected.