An air conditioner includes a housing having first and second suction ports; a heat exchanger configured to exchange heat with air brought in through the first suction port; a first discharging port configured to discharge the heat-exchanged air; a second discharging port configured to discharge air brought in through the second suction port to be mixed with air discharged from the first discharging port at outside of the housing; a discharging door having a plurality of discharging holes, through which air directed to the first discharging port is discharged out of the housing, and selectively opening the second discharging port by movement operation of the discharging door.