Air conditioning systems perform at their worst in hot summer days, just when they are needed the most. The cooling capacity decreases by 14-15% and the power draw increases by 31%. The problem occurs in condensers which has to change vapors refrigerant into liquid forcing the air through the unit and absorbing heat from the refrigerant causing it to condense. Applying water fogging system to air-cooled chillers can improve the efficiency under most of the working conditions, as the water mist could lower… the air temperature entering the condenser. On typical air-cooled chillers, a reduction in condenser air temperature of 6 degree Celsius will result 14% improvement in efficiency and 12 degree Celsius about 25-30%. Tests have shown that this power absorbing reduction is achievable, although it depends on external factors such as saturation level.