Elevate Your Comfort: Discover the Efficiency of Inverter Air Conditioners

If you prioritize robust performance, consistent temperatures, and lasting economic benefits, then inverter air conditioners are the ideal choice. Conversely, if the upfront expenses of purchasing an inverter AC pose a concern and occasional temperature variations aren’t bothersome, non-inverter ACs offer a suitable alternative. By varying motor speed, inverter air conditioners control temperature without requiring numerous start-stop cycles. When compared to non-inverter versions, this leads to less power waste, which eventually translates into energy savings.

Inverter technology-based air conditioners present a higher initial investment but offer numerous benefits. These AC units adjust compressor speed based on ambient temperature, leading to improved energy efficiency compared to non-inverter models. Opting for an inverter AC may seem like a wise decision due to its advantages. However, even with ample information and budget considerations, finalizing the choice can remain challenging. The best option depends on individual needs, capacity, budget, preferences, and environmental concerns. Practical considerations such as size, cost, capacity, noise level, and after-sales service also play crucial roles in decision-making. Here’s a comprehensive compilation of factors to consider before making a purchase. 

Inverter or non-inverter for you?

In an inverter AC, the compressor (fitted in the outdoor unit) is powered by a variable-speed drive or ‘inverter’ that enables the compressors to run at range of speeds from slow to fast, to match the output required. An inverter unit will gradually increase its capacity based on the capacity needed in the room to cool down or heat up the room. This means the compressor doesn’t need to switch on and off continuously, but instead just speeds up or down as need demands. By not actually having to stop and start several times a day, there’s less stress on the compressor and less electricity is used, which is why inverter models are generally more efficient and cost less to run. They can maintain a set temperature within a narrow range. Many split ACs in the market these days are inverter models.

Most conventional compressors run at a constant speed and these types of units vary their capacity by switching on and off at different intervals. Switching on this type of unit will start to run on full load. This can cause more wear and tear on the compressor and uses more power to start up each time. These models aren’t as efficient to run as the inverter models but can be cheaper to buy.

Types of Air Conditioners

  • Window air conditioner: This is usually utilised for freezing individual room/ chamber/ apartments. All the parts of a window air conditioner are fitted in one casing.
  • Split air conditioner: This consists of an outside metal cabinet that holds the compressor, condenser, and fan, including an indoor assembly that holds the evaporator and air handler.
  • Inverter Air Conditioner: In inverter air conditioner, an inverter controls the speed of the compressor motor, which continuously regulates the temperature.

Why opt for Inverter Air Conditioners?

The inverter air conditioner is by far the most energy efficient. It is more economical and smoother in operation than the fixed speed air conditioner. It consumes less electricity due to its variable speed of compressor and is also good for the environment.

Important Brands: LG, Samsung, Daikin, Carrier, Midea, Haier, Voltas, Hitachi, Blue Star, Whirlpool, and Panasonic etc.

What is cooling capacity?

Cooling capacity is the measurement of a cooling system and its ability to remove heat from a space. They can be described in tons to signal how much water at X temperature can be frozen in X amount of time.

How to choose right capacity

The capacity of air conditioners is measured in terms of tons. Split and window ACs are available in various capacities (1/1.5/2 tons). The tonnage of an AC does not refer to its weight; it is a unit used to determine the rate at which an AC can cool a room. In simple terms, a larger room requires an air conditioner with a higher tonnage. A single ton is rated at 12000 BTU. As per international standards, it is said that you require about 20 BTU per sq. feet.

Room size

AC capacity

Up to 100 square feet

0.8 ton

Up to 150 square feet

1.0 ton

Up to 250 square feet

1.5 ton

Up to 400 square feet

2.0 ton

The What’s and How’s

What is the inverter technology in air conditioners?

The inverter technology is the latest evolution of technology. An inverter is used to control the speed of the compressor motor, to continuously regulate the temperature. The DC inverter units have a variable-frequency drive that comprises an adjustable electrical inverter to control the speed of the electromotor, which means the compressor and the cooling/heating output. The drive converts the incoming AC current into DC and then through a modulation in an electrical inverter produces the current of desired frequency. A microcontroller can adjust the speed of the compressor.

How does an inverter save energy?

The inverter technology eliminates wasted operation in air conditioners by efficiently controlling motor speed. In inverter ACs temperature is adjusted by changing motor speed without turning the motor on and off. The motor speed in non-inverter ACs remains constant and temperature is adjusted by turning the motor on and off, thereby consuming more energy.

What is the benefit of inverter technology?

Every air conditioner is engineered to handle a maximum peak load, meaning a 1.5-ton AC is tailored for specific room dimensions, while a 1-ton AC is suited for a different size, and so forth. However, room sizes vary, and a standard 1.5-ton air conditioner will always operate at its peak power requirement when the compressor is active. Conversely, an inverter technology-based air conditioner operates continuously but draws only the necessary power to maintain the desired temperature stability. It dynamically adjusts its capacity according to the cooling demands of the room it serves, resulting in significantly lower power consumption and electricity usage.Are window ACs with inverter technology available in the market?

There is no window AC with inverter technology.

Are there star ratings for inverter ACs?

Bureau of Energy Efficiency (BEE) had notified a new star rating standard for inverter technology ACs. Most of the inverter AC models are in 3, 4 and 5-stars rating range of BEE. The star ratings for energy labelling became mandatory for inverter ACs in January 2018.

Advantages of an Inverter AC

  • About 30 per cent to 50 per cent cheaper to run as it consumes less power compared to a conventional AC.
  • No voltage fluctuation caused by compressor.
  • Maintains constant room temperature.
  • Efficient cooling and heating.
  • Can be run on solar panels.
  • Apart from savings in monthly electricity bill, there is huge savings on fuel if run on backup generator.
  • The additional price paid for an inverter AC gets recovered in electricity bills within a few months.
  • Environment-friendly due to the use of better refrigerants.
  • Safe for household wiring due to lower power consumption.
  • Suitable for large and small rooms. 

Disadvantages of an Inverter AC

  • If room is not insulated, power consumption increases and so does the electricity bill.
  • Efficiency decreases at noon if weather is extremely hot (over 45 degrees C).
  • Relatively expensive repair and maintenance due to the expensive service support and the components used.
  • Models too powerful for the room size may run frequent short cycles to achieve the target temperature. This can result in the room getting too cold or too hot; inadequate dehumidification (that is, not drying the air enough, making the room feel less comfortable); increased power usage and running costs; and wear and tear on the system.
  • Underpowered models may have to run more often at maximum output and dry the air too much. 

Keep Your Checklist Handy

  • Noise

Check the air conditioner’s noise levels; these can be found in the specifications. Some models have a quiet mode for the indoor unit, and sometimes the outdoor unit too. This may reduce the cooling/heating power or airflow but will keep the air conditioner running at a very quiet level.

A noisy indoor unit may interfere with your activities, conversation, or sleep. A noisy outdoor unit can disturb you or your neighbours.

  • Capacity

The capacity of the air conditioner should be considered depending on the floor size of the room where it will be installed. A rough measure is that an area in the range of 120 ~140 sq. ft area will need a 1-ton AC, 150 ~180 sq. ft area will need 1.5 ton, and 180 ~240 sq. ft area will need 2 ton AC.

  • Star-rating labels

Once you’ve determined the required capacity for your AC, it’s important to compare the star ratings of models with similar capacities. Star ratings range from 1 star to 5 stars, indicating varying levels of energy efficiency and greenhouse gas emissions. These ratings are standardized and implemented by the Bureau of Energy Efficiency (BEE), Government of India. AC units with more stars consume less electricity compared to those with lower star ratings.

For ACs used regularly for more than 4 hours per day, opting for a higher star-rated (4-5 stars) model is advisable, as it leads to lower running costs. However, if usage is less frequent, a 3-star AC can suffice. 3-star ACs are particularly popular as they strike a balance between power savings and affordability, offering consumers a significant price advantage compared to 5-star models.

After-sales services

After-sales service and other add-on features like warranty will certainly be a plus for your purchase. Look for longer warranty and a service-oriented brand that has the capabilities and good network to meet the servicing need of your product.

→ What is done in AC servicing?

AC condenser and evaporator coil cleaning. Dust and dirt are core enemies of your air conditioning or AC system as they cause overheating of the system. During AC service, the technician cleans the dust and debris from the condenser coil and evaporator coil and other key components of the system. Air conditioners should be inspected, cleaned, and serviced at least once a year.

→ Copper VS Aluminium Coils: In recent years, air conditioners have started featuring aluminium coils (condenser coils) as an alternative to copper coils. While aluminium coil ACs may come at a slightly lower cost, they often have a shorter lifespan and reduced durability. Therefore, it’s advisable not to compromise on quality and always prioritize copper coil ACs. Copper coil units typically offer a longer lifespan and are associated with fewer complaints regarding leakage. Investing in a copper coil AC ensures better reliability and longevity, outweighing any initial cost savings associated with aluminium coil models.

→Installation & cartage: While placing order, clear terms of payment (cash or cheque/draft) installation charges if any. It is generally included in the AC’s cost. Also insist for the free home delivery while placing the order.

→Slow Down the Running Costs

Heating and cooling appliances account for about 40 percent of the energy usage. To save money when running your air conditioner, there are several things you can do.

  • Size:Having the correct AC size is an important first step.
  • Star ratings:A model with more stars will be more efficient and use less power than a model with fewer stars.
  • Make your home as energy efficientas possible. 
  • Use economy mode(‘Eco mode’) if your air conditioner has one. 
  • Set the thermostat (target temperature) to a reasonable temperatureso the system doesn’t have to work too hard and use more power than necessary. 

Keeping a Reasonable Temperature

On a scorching hot day, such as one reaching 43 degrees Celsius, the temptation to set the air conditioner to a low temperature like 20 degrees Celsius to quickly cool the room may be strong. However, opting for a more moderate setting, such as 25 degrees Celsius, not only reduces wear and tear on the AC’s motor but also results in significant savings on your energy bill. Each degree cooler or warmer, in winter, can increase running costs by approximately 10 percent.

Similarly, in colder weather, like when it’s 10 degrees Celsius outside, setting the indoor temperature to 18 degrees Celsius instead of 25 degrees Celsius can lead to substantial energy savings.

Efficiency also depends on external temperature conditions. It’s generally recommended to aim for a maximum temperature differential of about 8 degrees Celsius. For instance, on a day with a high of 35 degrees Celsius, setting the indoor thermostat to 27 degrees Celsius is advised for optimal efficiency. However, many people still prefer cooler settings.

Achieving a larger temperature differential may be feasible if your house is highly thermally efficient, such as being well-insulated or having double-glazed windows.

The Bureau of Energy Efficiency (BEE) has established new energy performance standards for room air conditioners, mandating that the default temperature be set at 24 degrees Celsius (75.2 degrees Fahrenheit). This regulation aims to promote energy efficiency and reduce power demand.

At a Glance: Comparing Inverter Air Conditioners

For our survey, we shortlisted regular-selling models of inverter air conditioners. The survey was carried out in March 2024.

S No. Brand




Condenser Coil


ISEER* (Wh/Wh) BEE Star Rating

Noise Level,


Price in Rs.



1 Haier 2.0 ‎HSU24E-TXS3BE-INV Copper 3.85 3 34 50990 1+10
2 Voltas 2.0 243V Vectra Elite Copper 3.81 3 45 42140 1+10
3 Lloyd 2.0 GLS24I5FWGEV Copper 5.06 5 43 51990 1+10
4 LG 2.0 RS-Q24ENXE Copper 3.96 3 32 54450 1+10
5 Carrier 2.0 ‎CAI24ES3R32F0 Copper 3.90 3 39 48990 1+10
6 Panasonic 2.0


Copper 4.50 4 39 53990 1+10
7 Samsung 2.0


Copper 4.06 3 45 52990 1+10
8 Daikin 1.5


Copper 5.20 5 38 45490 1+10
9 Panasonic 1.5 CS/CU-NU18YKY5W Copper 5.10 5 39 43990 1+9
10 Panasonic 1.5 CS/CU-NU18ZKY5W Copper 5.10 5 38 44990 1+10
11 Panasonic 1.5 CS/CU-SU18ZKYWT Copper 3.90 3 38 36990 1+10
12 LG 1.5 TS-Q19YNZE Copper 5.20 5 31 46590 1+10
13 Hitachi 1.5 R32 – RSRG518FFEO Copper 5.20 5 34 41999 1+10
14 LG 1.5


Copper 4.00 3 26 37490 1+10
15 LG 1.5 TS-Q19JNYE Copper 4.62 4 31 42490 1+10
16 Godrej 1.5 EI 18IINV5R32 WWA Copper 5.10 5 44 36990 1+10
17 Samsung 1.5 AR18CYLZABE Copper 3.96 3 45 34990 1+10
18 Carrier 1.5 CAI18ES4R33F0 Copper 4.50 4 37 37990 1+10
19 Voltas 1.5 185V Vectra Elite Copper 5.00 5 45 38100 1+10
20 Hitachi 1.5 RSOS518HEEA Copper 4.55 5 34 43700 2+10
21 Blue Star 1.5 IA318FNU Copper 3.98 3 45 35000 1+10
22 Blue star 1.5 IC518YNUR Copper 5.02 5 50.2 43990 1+10
23 Samsung 1.5 AR18CYLAMWK Copper 3.96 3 45 38699 1+10
24 Lloyd 1.5 GLS18I3FWAGC Copper 3.84 3 32 32990 1+10
25 Blue star 1.0 IA312YNU Copper 3.85 3 30.5 31990 1+10
27 Godrej 1.0 AC 1T EI 12IINV5R32-WWR Copper 5.10 5 40 32990 1+10
28 LG 1.0 RS-Q13JNYE Copper 4.70 4 21 34990 1+10
29 Carrier 1.0 CAI12ER3R34F0 Copper 3.88 3 32 30990 1+10
30 Godrej 1.0 EI 12TINV3R32-GWA Copper 3.95 3 37 28990 1+10

# Comprehensive + on compressor (For latest prices check at amazon.in or flipkart.com)

* ISEER: ISEER stands for Indian Seasonal Energy Efficiency Ratio. It is the ratio of total annual amount of heat that the equipment can remove from the indoor air when operated for cooling in active mode to the total annual amount of energy consumed by the equipment during the same period. Higher ISEER rating means a more energy-efficient air conditioner that can help you save on your energy bills in the long run.

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