Abstract: In an air conditioner, the air conditioner includes a casing having an indoor space region and an outdoor space region; an indoor unit installed in the indoor space region, sucking air and cooling the sucked air through a first heat exchanger, an outdoor unit installed in the outdoor space region, sucking air and releasing heat of the air to the outside through a second heat exchanger; and a turbo fan installed in the outdoor space region for generating air flows so as to flow air to the second heat exchanger.