The invention relates to an air conditioning unit provided with means for cooling and heating air, including a casing with a plurality of air outlets. At least one heating heat exchanger is provided that in its vertical extension has at least one cold air passage whereby, the one cold air passage is disposed between two heating paths. An evaporator is provided, downstream of which in direction of the air flow the heating heat exchanger is disposed, such that after the heating heat exchanger there is a temperature-layered air flow, the layers of which are wholly or partly assigned directly to the air outlets.