Inverter Wall Mounted Split Air Conditioners: INVERTER air conditioner changes the speed of the compressor by varying the frequency of the power supply to give superior cooling, ranging from high to low.When an INVERTER air conditioner is started, the compressor runs at high speed for quick cooling. But once the set temperature is reached, the INVERTER air conditioner enters an ‘energy saving mode’ by reducing the compressor speed. Thus, effectively reducing its power in order to save energy.