Air conditioning system is essential for maintaining thermal comfort in indoor environments, particularly for hot and humid climates. Nowadays, air conditioning, comprising cooling and dehumidification, has become a necessity in commercial and residential buildings and industrial processes. It accounts for a major share of the energy consumption of a building or facility. Energy efficiency for air conditioners has received increasing attention in recent years with the intense emphasis on environmental concern and energy consumption. As the main energy consumption component of air conditioner, compressor needs further work to accomplish the transition of performance evaluation from one operation condition to its actual usage. Inverter, a device in the air conditioner, controls frequency of power supplied to compressor motor. Compressor motor controls the rotational speed of the compressor and the compressor ensures refrigerant flow is commensurate with the cooling requirement of the room. This paper discusses Inverter operated air conditioners which are being more popular due to better energy efficiency, excellent control over room temperature, and less noisy.