Abstract: In this research, a study to use direct evaporative cooling supported by a heat exchanger to enhance the performance of conventional air conditioning unit experimentally is presented. Window type air-conditioner unit is implemented in the experiment where the A/C system is modulated to provide a wide range of various weather conditions. The proposed setup simulates severe hot weather condition where the temperature reaches up to 55°C. Several tests are conducted in this investigation and the study addresses four different challenges, namely, COP, cooling capacity, energy saving and the compressor auto-shutdown in very high weather temperature. The experimental results show that using evaporative cooling assist can significantly enhance the system to overcome the previous challenges. The refrigeration capacity is increased in the range of 10-30% whereas the electric demand in a compressor is reduced by 0.12-0.2 for each air temperature degree reduction (for one ton of refrigeration). The air-conditioning unit can run even with the voltage drop of 170 V instead of 220 V which cannot be performed in conventional air condenser.