PURPOSE: A system for an air conditioning is provided to prevent the performance degradation of a product by detecting the leakage of refrigerant in advance. CONSTITUTION: A system for an air conditioning comprises followings. An outdoor unit(OU) includes an outdoor unit case and a ventilation fan. The outdoor unit case forms the outer shell. The ventilation fan is arranged inside the outdoor unit case. A refrigerant sensor(200) senses the leakage refrigerant and is arranged at the bottom surface of the outdoor unit case. An indoor unit includes an indoor unit case and an outlet. The indoor unit case forms the outer shell. The outlet discharges the heat-exchanged air and is located at one side of the indoor unit case. The refrigerant sensor senses the leakage refrigerant and is arranged at one side of an outlet.
