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A unit for evaporative cooling in condenser of domestic air conditioner and its performance testing on effectiveness and reduction in power consumption. Evaporative cooling in condenser of Split A.C is achieved by spraying water on the fins of condensing unit at regular interval of time. Evaporative cooling will increase the rate of heat transfer and thus further sub cooled refrigerant will be obtained at the exit of condenser. Due to this sub cooling, refrigeration effect increases which results in increase in COP and reduces power consumption.