An air conditioning device for conditioning the air present in an indoor environment, the device comprising: - a fluidic circuit configured to circulate an operative fluid and including a condenser and an evaporator configured for defining respective heat exchange interfaces between the operative fluid and the air conveyed thereto; - a casing housing the fluidic circuit, internally defining a first compartment housing the condenser and a second compartment housing the evaporator, and having a first inlet fluidly connectable with an outdoor environment to receive therefrom outdoor air to be conditioned, a second inlet fluidly connectable with the indoor environment to receive stale air, a first outlet fluidly connectable with the indoor environment to introduce therein conditioned air and a second outlet fluidly connectable with the outdoor environment to eject the stale air; - a pair of upstream flaps (12, 13) fluidly arranged downstream of the first inlet and of the second inlet and upstream of the first compartment and of the second compartment and actuatable to respectively direct the outdoor air and the stale air selectively towards the condenser or the evaporator; and characterised in that the device comprising: - a pair of downstream flaps (14, 15) fluidly arranged downstream of the first compartment and of the second compartment, respectively, and upstream of the first outlet and of the second outlet and actuatable to respectively direct the heated air and the cooled air selectively towards the first outlet or the second outlet; wherein the device also includes a control unit configured to control the actuation of the upstream flaps (12, 13) and the downstream flaps (14, 15) for defining: - a heating operating mode for heating the indoor environment, in which the upstream flaps (12, 13) are actuated to direct respectively the stale air towards the second compartment and the outdoor air towards the first compartment, and the downstream flaps (14, 15) are actuated to respectively direct the heated air towards the first outlet and the cooled air towards the second outlet; and - a cooling operating mode for cooling the indoor environment, in which the upstream flaps (12, 13) are actuated to respectively direct the stale air towards the first compartment and the outdoor air towards the second compartment, and the downstream flaps (14, 15) are actuated to respectively direct the heated air towards the second outlet and the cooled air towards the first outlet. - a fluidic circuit configured to circulate an operative fluid and including a condenser and an evaporator configured for defining respective heat exchange interfaces between the operative fluid and the air conveyed thereto; - a casing housing the fluidic circuit, internally defining a first compartment housing the condenser and a second compartment housing the evaporator, and having a first inlet fluidly connectable with an outdoor environment to receive therefrom outdoor air to be conditioned, a second inlet fluidly connectable with the indoor environment to receive stale air, a first outlet fluidly connectable with the indoor environment to introduce therein conditioned air and a second outlet fluidly connectable with the outdoor environment to eject the stale air; - a pair of upstream flaps (12, 13) fluidly arranged downstream of the first inlet and of the second inlet and upstream of the first compartment and of the second compartment and actuatable to respectively direct the outdoor air and the stale air selectively towards the condenser or the evaporator; and - a pair of downstream flaps (14, 15) fluidly arranged downstream of the first compartment and of the second compartment, respectively, and upstream of the first outlet and of the second outlet and actuatable to respectively direct the heated air and the cooled air selectively towards the first outlet or the second outlet; - a heating operating mode for heating the indoor environment, in which the upstream flaps (12, 13) are actuated to direct respectively the stale air towards the second compartment and the outdoor air towards the first compartment, and the downstream flaps (14, 15) are actuated to respectively direct the heated air towards the first outlet and the cooled air towards the second outlet; and - a cooling operating mode for cooling the indoor environment, in which the upstream flaps (12, 13) are actuated to respectively direct the stale air towards the first compartment and the outdoor air towards the second compartment, and the downstream flaps (14, 15) are actuated to respectively direct the heated air towards the second outlet and the cooled air towards the first outlet.