Air conditioning device, in particular for a vehicle

The motor vehicle air conditioning (10) has an air feed duct (12) containing a cooler (14) and a heater (18) downstream in a branch duct (20). There is a bypass canal parallel to the branch duct with a mixing valve (22). An adjustable flap (32,34,38) controls the air flow distribution between two openings (24,26,28) to the vehicle passenger space.