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.

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. 

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.

# 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.