An air conditioner includes a heat exchanger for exchanging heat with air introduced to an inside of a housing and a fan for blowing the air having heat exchanged by the heat exchanger to an outside of the housing, the air conditioner capable of blowing air at various airflows by controlling a door configured to selectively open a first portion and a second portion, different from the first portion, of an air outlet of the housing and controlling a guide member configured to controlling a flow path inside the housing.