Apparatus and method for air conditioning of passenger compartments, especially vehicle passenger compartments.

The apparatus has a heater and air conditioner with a flow channel (6) for air flow to air condition a passenger compartment An evaporator is arranged in a flow input side of the channel. Two heat exchangers (14a, 14b) are provided in the channel, where the exchanger (14a) is formed as a fuel driven air/air heat exchanger and the exchanger (14b) is formed as a water/air heat exchanger and is arranged at a coolant circuit of an engine. An independent claim is also included for a method for air conditioning a passenger compartment of a vehicle.