An air conditioning apparatus and an air conditioning method for cooling a passenger space of a vehicle that accommodates a user include a tank that is capable of storing compressed air, and a control unit to release the compressed air stored in the tank into the passenger space. Energy that is generated without putting a workload on the power source or electric power of the vehicle is used for at least one process of compressing air in the tank, cooling the compressed air stored in the tank, and heating the compressed air stored in the tank.