If you search for an air conditioner today, you will find the word "Inverter" printed in huge letters on every box, every brochure and every e-shop listing. It has become the ultimate synonym for electricity savings.
However, if you ask the average consumer "What exactly is Inverter?", the most common answer you will get is: "Well, it's a system that uses less electricity". This is true, but it doesn't explain why.
To understand why this technology revolutionised the industry (and why, if you use your air conditioner incorrectly, Inverter won't save you), we need to look at how old machines worked and how the Inverter "brain" changed the rules of the game.
The "heart" of an air conditioner (what produces cooling or heating) is a large motor in the outdoor unit called the compressor. In old machines, this motor had only two speeds: 100% (Full Throttle) or 0% (Off).
If you set the thermostat to 26°C, the machine would fire up at 100%, drawing enormous amounts of electricity (Start). Once the room reached 26°C, the compressor would shut off completely (Stop). After a while, the room would warm up again (e.g. rising to 28°C), and the compressor would "slam" back on at 100%.
Imagine driving your car on the motorway, and instead of maintaining a steady speed, you floor the accelerator, then slam on the brakes until you stop, and then floor it again. The fuel consumption (and engine wear) would be enormous! That's exactly what old AC units did.
The word Inverter does not describe a new type of refrigerant or a different fan. It describes an electronic circuit board (a microcomputer) that sits before the compressor motor.
This circuit board varies the frequency of the electrical current (the Hz) feeding the motor. By changing the current, it smoothly adjusts the compressor's RPM (speed), exactly like gently pressing the accelerator pedal in a car.
You turn on the air conditioner at 26°C. The Inverter senses the room is "boiling" (35°C), so it runs the motor at 100% to cool it down quickly.
As the temperature approaches 26°C, the "brain" instructs the motor: "Don't switch off! Just reduce your speed to 30%". The machine never stops. It continues running quietly at idle, delivering exactly the cooling needed to maintain 26°C while only compensating for losses.
Inverter technology is not merely a marketing slogan. The advantages are measurable and substantial.
The moment a large motor starts from zero (start), it momentarily draws 3 to 4 times more electricity than during normal operation. By eliminating continuous start-stop cycling, Inverter reduces electricity consumption by up to 50%.
No more hot-cold swings. The room stays "locked" at the degrees you requested, without deviations.
Since the machine runs at 30% or 40% of its capacity most of the time, the outdoor compressor sounds like a gentle murmur, allowing you (and your neighbours) to sleep peacefully.
The continuous, violent start-stop cycles placed tremendous mechanical stress on old motors. An Inverter compressor running smoothly lasts many more years without breakdowns.
To save electricity with Inverter, you must break an old, bad habit: Stop turning your air conditioner on and off every half hour!
Many people come home, set the Inverter to 18°C "to freeze the place", and after 20 minutes when they feel cold, they switch it off. As soon as they get warm again, they turn it back on. By doing this, you completely negate the Inverter board. You force it to work permanently at 100% like an old ON/OFF machine, burning maximum electricity!
Set your air conditioner to 26°C (in summer) or 21°C (in winter) and... leave it alone! Let it run continuously for 5, 8 or 10 hours. The brain will drop the speed to minimum, the electricity meter will "go to sleep", and you will enjoy the coolest and cheapest summer of your life.
Inverter technology is not a luxury - it is now the only option (and European law). It is the reason modern air conditioners are one of the cheapest heating solutions in winter.
Now that you have an efficient, "smart" machine, you need to decide where to place it. If the installer mounts it above your sofa or directly opposite your bed, the air conditioning experience will become a nightmare. In our next article: Ideal Air Conditioner Placement - Where the indoor and outdoor units should go so the airflow doesn't blow directly on you.
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