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 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 , 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 by the low pressure detected by the at least one pressure sensor . 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 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 , 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 by the low pressure detected by the at least one pressure sensor . <EOS>