Inverter AC vs Normal AC: Which One Should You Buy?
Quick answer: A normal air conditioner runs its compressor at full power or switches it off, and it alternates between the two often to hold the temperature. An inverter air conditioner varies the speed of the compressor motor, so it can keep the temperature steady without the constant on and off cycles. ENERGY STAR describes this variable speed control as quieter and as a way to save energy. Every split AC in our current range is an inverter model.
How a normal air conditioner works
In a conventional room air conditioner, the compressor runs at its maximum capacity while the room is warmer than the set temperature. When the desired temperature is reached, it switches off. ENERGY STAR notes that the compressor typically alternates frequently between full on and off. Each restart draws power, and the temperature rises and falls between the cycles.
How an inverter air conditioner works
An inverter air conditioner uses a variable speed compressor motor. Instead of switching between full power and off, it speeds up when the room is far from the set temperature and slows down as the room approaches it. ENERGY STAR says that variable-output room air conditioners can vary the speed of the internal compressor motor to control the temperature continuously.
The practical result is that the room stays closer to the temperature you set. The unit does not need to start and stop as often.
Comparison: normal AC and inverter AC
| Point | Normal AC | Inverter AC |
|---|---|---|
| Compressor | Runs at full power or switches off | Changes speed to match the room |
| Temperature | Rises and falls between on and off cycles | Held closer to the set temperature |
| Noise | Starts and stops often, which ENERGY STAR contrasts with variable operation | Quieter, according to ENERGY STAR |
| Energy | Uses more energy for the same steady comfort | Variable speed saves energy, according to ENERGY STAR |
| Purchase price | Prices differ by model and change over time, so compare current prices at the branch | |
Is an inverter AC worth the extra money?
The answer depends on how many hours you run the unit. An AC that runs for many hours a day will spend more time in its efficient, steady operation, so the energy difference adds up. A room that is used only for a few hours in the evening gains less from variable speed. Ask the branch how many hours the unit will run in your home, and compare the energy figures on the product page.
What our range offers
Our split ACs are 1.5 ton models from Gree, Kenwood, Orient, PEL and Super General. On their product pages each one is listed as an inverter unit, and several are described as heat and cool, which means they can also warm the room. Browse the split AC range to compare the models.
If you are not sure of the size you need, check it first with our AC size calculator and our guide on how to choose AC size for your room. An inverter unit that is too large still cools the room too quickly, so the size matters as much as the type.
When a normal AC may be enough
A normal air conditioner can suit a room that is used only occasionally, or a buyer who wants the lowest purchase price and accepts that the temperature will swing a little between cycles. The choice is about how you use the room, not about which type is better in every case.
Practical points for either type
- Choose the capacity first. A correctly sized unit of either type is more comfortable than an oversized one.
- Keep the outdoor unit clear of obstacles so that air can move around it.
- Ask the branch who handles service in your area, and keep the warranty card with your receipt.
How to compare two models on the product pages
Product pages list a model’s type, capacity and features. When you compare two units, check the points below in the order given, because the first two decide whether the models suit your room at all.
- Capacity. Check the tonnage or BTU per hour against the tonnage chart in our guide on how to choose AC size for your room. A unit with the right type but the wrong capacity is still the wrong unit.
- Type. Look for the words “inverter” or “DC inverter” in the name or the specification. Our split ACs are all listed as inverter units.
- Function. Some models are listed as heat and cool, which means they can also warm the room. If you need heating, choose a model with that function.
- Refrigerant. The product pages list the refrigerant. For example, the Gree and Kenwood models list R410A.
- Noise and other features. Compare any noise figures and features the page lists, and ask the branch to run the model if you can.
Installation and everyday care
An air conditioner works best when it is installed correctly. Ask for installation by a qualified technician, and keep the outdoor unit clear of obstructions so air can move freely. Clean the filters as the manual describes, and keep the indoor unit free of dust. These steps help any type of air conditioner, inverter or normal.
Power supply at home
Check the power point and the wiring before the unit arrives. Ask the branch whether your model needs its own circuit and whether a voltage stabiliser is advisable for your supply. Do not assume that a power point used for another appliance is suitable for an air conditioner.
What inverter means for the room
Because the compressor adjusts its speed, a room reaches the set temperature and then stays near it. The unit does not need to work at full power to hold the temperature. This is the practical difference you will notice day to day: a steadier temperature, with fewer sudden changes in how the room feels.
The benefit shows most in rooms where the cooling need changes during the day, for example when people come in from outside or the afternoon sun reaches the window. The compressor can change its output to meet that need, rather than switching fully on and off to catch up. ENERGY STAR describes this as a way to control the temperature continuously.
Frequently asked questions
What is the main difference between an inverter AC and a normal AC?
A normal AC switches its compressor fully on or fully off. An inverter AC changes the compressor speed to match the room, which keeps the temperature steadier.
Is an inverter AC quieter?
ENERGY STAR describes variable-output room air conditioners as able to regulate the temperature more quietly than conventional units.
Does an inverter AC save energy?
ENERGY STAR states that variable-output units save a significant amount of energy during operation. The saving depends on how many hours the unit runs and on the room, so compare the energy figures on the product pages.
Are all the split ACs at SK Electronics inverter models?
Yes. All five split ACs in our current range are listed as inverter units on their product pages.
Should I choose inverter or normal if I run the AC all day?
For long daily running, the steady operation of an inverter unit is an advantage. Ask the branch to explain the models that suit your hours of use.
Sources
- ENERGY STAR, Room Air Conditioners with Efficient Variable Output (how conventional and variable-speed units operate): energystar.gov, variable output room air conditioners
- ENERGY STAR, Room Air Conditioners (variable speed technology in certified models): energystar.gov/products/room_air_conditioners