An experimental study was carried out to compare energy performance of a non-inverter Air-Conditioner (AC) and that of an inverter AC having the same rated cooling capacity of 12000 BTU/h. Under different cooling part load values of 25 percent, 50 percent, 75 percent, and 91 percent, it is found that compared to the non-inverter AC, the inverter one can save from 10 percent to 52 percent of power consumption. Coefficient of performance (COP) of the inverter AC and that of the non-inverter one were also estimated to be in the range of 3.1 to 5.2 and 2.3 to 2.9, respectively.