The principle is much like driving a car. It is more comfortable to drive a car when there is no need to repeat start-and-stop operations. Using an inverter provides the same effect in heat pumps. When a heat pump starts up, the inverter sets it in full-power operation to quickly bring the room temperature to the set temperature. Once the set temperature is reached, the inverter maintains efficient operation to minimize the change in the room temperature. This prevents wasteful consumption of electricity and keeps the room temperature at a comfortable level.