An air conditioner comprising: a cabinet configured to form an external appearance of an outdoor unit, and have an air inlet and an air outlet; a heat-exchanger accommodated in the cabinet to perform heat exchange; a blowing fan configured to suction air through the air inlet, cause the suctioned air to pass through the heat-exchanger to form heat-exchanged air, and discharge the heat-exchanged air through the air outlet; an airflow directing apparatus provided at an upper part of the air outlet, and configured to direct flow of the heat-exchanged air to an outlet of the airflow directing apparatus; and at least one blade coupled to the outlet of the airflow directing apparatus, and configured to adjust an amount of the flow of the heat-exchanged air; a compressor disposed in the cabinet, and configured to compress a refrigerant, wherein the heat-exchanger is a condenser configured to condense the refrigerant discharged from the compressor through heat exchange between the refrigerant and the suctioned air to form the heat-exchanged air, characterised by at least one pressure sensor (17, 18) mounted to each of a discharge part and a suction part of the compressor, and configured to detect high pressure of a high pressure part of the refrigerant passing through the compressor and low pressure of a low pressure part of the refrigerant passing through the compressor; and a controller configured to control the amount of the flow of heat-exchanged air by controlling an angle of the at least one blade to thereby control an amount of the heat exchange of the condenser, wherein the controller controls the angle of the at least one blade according to the low pressure detected by the at least one pressure sensor (17, 18), a compression ratio, and a current angle of the at least one blade, and the compression ratio is a value that is acquired by dividing the high pressure detected by the at least one pressure sensor (17, 18) by the low pressure detected by the at least one pressure sensor (17, 18). a cabinet configured to form an external appearance of an outdoor unit, and have an air inlet and an air outlet; a heat-exchanger accommodated in the cabinet to perform heat exchange; a blowing fan configured to suction air through the air inlet, cause the suctioned air to pass through the heat-exchanger to form heat-exchanged air, and discharge the heat-exchanged air through the air outlet; an airflow directing apparatus provided at an upper part of the air outlet, and configured to direct flow of the heat-exchanged air to an outlet of the airflow directing apparatus; and at least one blade coupled to the outlet of the airflow directing apparatus, and configured to adjust an amount of the flow of the heat-exchanged air; a compressor disposed in the cabinet, and configured to compress a refrigerant, wherein the heat-exchanger is a condenser configured to condense the refrigerant discharged from the compressor through heat exchange between the refrigerant and the suctioned air to form the heat-exchanged air, characterised by at least one pressure sensor (17, 18) mounted to each of a discharge part and a suction part of the compressor, and configured to detect high pressure of a high pressure part of the refrigerant passing through the compressor and low pressure of a low pressure part of the refrigerant passing through the compressor; and a controller configured to control the amount of the flow of heat-exchanged air by controlling an angle of the at least one blade to thereby control an amount of the heat exchange of the condenser, wherein the controller controls the angle of the at least one blade according to the low pressure detected by the at least one pressure sensor (17, 18), a compression ratio, and a current angle of the at least one blade, and the compression ratio is a value that is acquired by dividing the high pressure detected by the at least one pressure sensor (17, 18) by the low pressure detected by the at least one pressure sensor (17, 18).