One of the major component of a cold storage is Condenser which acts as an heat exchanger, where heat rejected form cold room to the surrounding. In air cooled condenser’s heat exchanger material should be very high thermal conductivity. Our job is to replace water cooled condenser with air cooled condenser. Where controlled air takes heat from the condenser coil. We used condenser coil material as copper( thermal conductivity = 385 w/m.k), and high velocity air has been passing through the coil( cross flow, air velocity = 3 m/s); we assumed that environmental temperature is 27 °C or 300K. Super heated ammonia is flowing through the coil and inlet temperature of ammonia is = 35°C, and exit temperature is = 32°C; and through the condenser pressure remains constant, that is P=1226.25 kPa, we measured that data for water cooled condenser and that condenser reject heat around Q= 5 KW; to do that job energy required to cooled the condenser with following water is around 3.1 KWH, Now we are going to replace water cooled condenser with air cooled condenser remaining heat load and others data are same.