One of the newest, low budget and energy-saving technology to be implemented. An inverter is used to control the speed of the compressor motor so that the temperature can be controlled. The input AC is converted to DC with a drive, the electrical inverter produces the desired frequency.
The installed microcontroller samples the ambient room temperature with respect to which it adjusts the motor speed. This technology and has proved to be highly efficient, with the reduction in motor speeds the consumption of power also reduces making it very cost effective. The inverter technology has so far been implemented in air conditioners and refrigerators.