Abstract: A vehicle temperature-control system includes a refrigerant circuit (22). The refrigerant circuit includes a compressor (24), at least one condenser heat-exchanger assembly (28) around which air (L1) to be heated can flow, and at least one evaporator heat-exchanger assembly (40), around which air (L2) to be cooled can flow. For each of the two heat-exchanger assemblies (28, 40), there are two inflow regions (48, 50, 78, 80) and two outflow regions (62, 64, 84, 86), which can be switched by means of flap assemblies (44, 56, 88, 92). Both a heating operating mode and a cooling operating mode are selected with the flap assemblies. A heat pump operation in the vehicle, e.g., a bus, is enabled.