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Old 22-05-2010, 04:31 AM   #1374
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Join Date: Dec 2008
Posts: 10,563
"Inverter has variable capacity whereby the compressor speed can be regulated according to the room load requirements. Non-inverter has fix capacity whereby compressor speed is fixed at one speed only. It either runs at full capacity or stop.”

While it sounds all rosy for inverter air conditioners as they are generally more energy efficient than non inverter ones, there is a report1 that prolonged usage of inverter air conditioning at full load might result in potentially higher energy bills than non-inverter models. According to the report, savings from the use of inverter air conditioners could be seen when only some units are turned on for eight hours or less in a day.
Wong says, “If the room is oversized, both inverter and non-inverter will consume energy as well. Therefore, it is important to select an air conditioner which 100 percent suits your room load requirements in order to save energy. Once you have selected an air conditioner which fulfills your room load requirements, inverter plays an important role to save energy as it does not need to operate at full load all the time to cool down the oversized room load requirements. Once the temperature setting is met, the compressor will slow down and operate in low speed to maintain the room temperature. That is why you will enjoy a constant room temperature when you use inverter.
“But if you opt for non-inverter air conditioner, the compressor will stop operating when the temperature setting is met, and it will operate again when the room temperature rises, the power consumption requires to start-up compressor operation is five to six times more compared to it being in operation. Nonetheless, the inverter may operate at full load or non-inverter may operate non-stop all the time if the outdoor unit was installed at the area with high outdoor ambience and the indoor temperature was set at the minimum with high fan speed.”
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