Window Type Air Conditioners: Efficient Cooling for Your Space

There is a wide array of air conditioner brands, each offering numerous models that differ primarily in aesthetics, design, appearance, colour, shape, and size. As a result, selecting the most suitable air conditioner can be a daunting task for consumers. Additionally, it is crucial to consider the latest models when making a purchase. The key factors to focus on while choosing the right AC include its energy efficiency ratio, power consumption, cooling capacity, and any unique features it may offer.

A major deciding factor for consumers is whether you want a window AC or a split AC model or latest Inverter Type AC (variable speeds). Though window units are cheaper and easy to install, split ACs are quieter, aesthetically more pleasing and provide better air distribution. But if there is a good provision for installing window category, go for window only. Globally windows ACs have almost gone out of production but in India we still have a good choice. Once you have decided to buy an air conditioner then a careful market study is required for which Consumer Voice has done some basic research.

Window air conditioners are quite popular because of their lower initial cost, compactness (single unit) and efficiency and ideal for small size rooms, bedrooms, small offices where provision of windows are already there to accommodate the unit. Window AC units are self-contained, single-unit air conditioners that are mounted inside an open window. Split type AC is very popular because it can be fitted in a room without having open up walls or windows to install AC. Split air conditioners are made up of two parts – an indoor unit and an outdoor unit that work together to cool the room. Usually, Split ACs are faster at cooling, more energy efficient and quieter than window AC. Split air conditioners for domestic & small offices use come in the cooling capacity ranging from 0.75 to 3.0 tons.

Room Size and Tonnage of Window AC 

Tonnage refers to the cooling capacity of the air conditioning system, where one ton is defined as the amount of heat required to melt one ton of ice in 24 hours. It is essential to choose an air conditioner with the right tonnage according to the size of your room.

Room Size


>120 Sq. feet


120-150 Sq. feet


150-180 Sq. feet


180-220 Sq. feet



Type – Split or Window

Window ACs are usually cheaper and relatively easier to install, however, they are much noisier as compared to a split AC. Split ACs provide better air distribution, are more beautiful to look at, and provide comparatively faster cooling. Additionally, split ACs provide higher efficiency and are more suitable for long-term use. Both types of air conditioners are available in a large variety of designs and sizes.

Important Criteria for Buying an Air Conditioner

Capacity: The capacity of the air conditioner should be considered depending on the floor size of the room for which the AC is required. A rough measure is that an area in range of 120 ~140 Sq. ft. area will need 1 ton, 150 ~180 Sq. ft. area will need 1.5 ton and 180 ~240 Sq. ft. area will need a 2 ton cooling capacity air conditioner.

Energy efficiency: Air conditioners come with star rated energy efficiency ratings, which has been implemented by the Bureau of Energy Efficiency (BEE). Therefore, any unit with more stars will consume lesser electricity than one with a lower star rating. If the regular usage of ACs are more than 4 hrs/day, go for higher star rated (4-5) AC, else 3 star can serve your purpose. 3-star ACs are most popular as mid-range power saving gives consumers a great price advantage as compared to a 5 star.

Copper VS Aluminium Coils: In recent years, air conditioners have been introduced with aluminium coils for their condenser units, offering a slightly lower cost but reduced durability over time. Therefore, it is highly recommended to prioritize air conditioners with copper coils and not compromise on cost when making a purchase. Copper coil ACs boast significantly longer lifespans and are associated with fewer leakage complaints, making them a more reliable and worthwhile investment.

Installation & cartage: Window air conditioners are so simple to install that even a person without much skill can do it. While placing order clear terms of payment (cash or cheque/draft), installation charges if any as it is generally included in the unit cost. Also insist for the free home delivery while placing the order.

After sales services: Look for a longer service oriented reputed brands which has the capabilities and good network to meet the servicing need of your product. Ask your friends and relatives for feedback.

Brand Selection: You should carefully choose an air conditioner brand which fulfils your need of maximum energy saving through highest EER, best cooling performance and extensive after sales service.

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.

Cooling Capacity: Cooling capacity is the measure of a cooling system’s ability to remove heat.

Power consumption: Electrical energy over time supplied to operate an electrical appliance.

Keeping a Reasonable Temperature

On a hot day – say 43 degrees C – you may be tempted to put the air conditioner way down to 20 degrees C to get the room cool as quickly as possible. But if you can cope with setting the temperature at 25 degrees C, you will save big on your energy bill. Each degree cooler, or warmer in winter, can add about 10 per cent to the running cost. The same principle applies in winter. If it’s 10 degrees C outside, try setting the indoor temperature to 18 degrees C rather than 25 degrees C.  Generally, you’ll get better efficiency by aiming for a maximum temperature differential of about 8 degrees C. So, on 35 degrees C Day, set your indoor thermostat to 25 degrees C. Realistically, most people will still go for a cooler temperature. You can probably aim for a bigger differential if your house is very thermally efficient (well-insulated, double-glazed, etc).

Star-rating labels: Once you’ve worked out what capacity you need, compare the star ratings of models of similar capacity. The more the stars (from 1 star to 5 stars), the lower the running costs and greenhouse gas emissions. Air conditioners come with star-rated energy-efficiency ratings; these have been standardized/implemented by the Bureau of Energy Efficiency (BEE), Govt Of India. Therefore, any AC with more stars will consume less electricity than one with a lower star rating.

Tips for optimal use of ACs

  1. Do not install AC units on walls that are exposed to direct sunlight through a major part of the day during summers.
  2. Reduce air-conditioning energy use by as much as 40 percent by shading your home as windows and walls. Plant trees to keep the day’s hottest sun off your house.
  3. Try turning your AC down at night and utilize the “sleep mode” which lowers the output on a timer.
  4. One will use 3 to 5 percents less energy for each degree air conditioner is set above 25°C to provide the most comfort at the least cost. Keeping ACs at (24-26 degree centigrade) can save electricity.
  5. Using ceiling fans allows you to set the temperature higher because the air movement will cool the room.
  6. Clean the air-conditioner filter every month. Clean filters enable the unit to cool down quickly and use less energy.
  7. Have your air conditioning unit checked if the Freon gas level is not correct, you will waste a lot of energy and your home will never be as cool as you want it.
  8. The gaps around the windows and doors leads to AC loss.
  9. Buy Inverter or split ACs instead of window ACs. They cost more, but they are more energy efficient and consume lesser electricity.
  10. Switch to evaporative coolers from air conditioners during hot/dry summer days.

Window Type Air Conditioners: Comparison at a Glance

The survey of window type air conditioners was conducted in the 3rd week of July 2023.

S No. Brand Model Inverter type/Fixed Speed



Ratio (EER)






Nose Level


Annual Power








Warrantee (Product+

compressor), year


Blue Star


WIB518LN Inverter type   1.5 56 1082 5 39199 1+4
2 LG RW-Q18WUZA Inverter type 3.68 1.5 44 1053 5 36990 1+10
3 LG PW-Q18WUZA Inverter type 3.68 1.5 44 1053 5 36990 1+10
4 Lloyd GLW18C3YWSEW Fixed speed 3.15 1.5 52 1180 3 27290 1+5
5 Voltas 185V Vertis Elite Inverter type 3.51 1.5 56 5 33699 1+10
6 Godrej WIC 18UTC3 WWA Inverter type 3.13 1.5 54 1263 3 29880 1+10
7 LG RW-Q18WUZA Inverter type 3.68 1.5 44 1053 5 36889 1+10
8 Voltas 183 LZH Fixed speed 2.92 1.5 55 1338 3 30000 1+5
9 Voltas 183V Vertis Elite Inverter type 3.15 1.5 56 3 30850 1+10
10 Godrej WIC 18UTC5 WWA Inverter type 3.55 1.5 54 1111 5 31860 1+10
11 LG RW-Q18WUZA Inverter type 3.68 1.5 44 1053 5 36889 1+10
12 Lloyd GLW18I3FWCEV Inverter type 3.13 1.5 52 1222 3 29890 1+10
13 Panasonic



Fixed speed 3.34 1.5 56 1169 5 35999 1+5
14 Blue Star WFA318LN Fixed speed 3.24 1.5 53 1168 3 29699 1+5
15 Carrier Estra DX -CAW18SC3R32F0 Fixed speed 3.21 1.5 52 1206 3 28990 1+5
16 Carrier Estrella Dx Fixed speed 3.00 1.5 52 1350 3 28999 1+5
17 O GENERAL AMGB12FAWA Fixed speed 3.29 1.1 4 33500 1+5
18 Godrej WIC 18UTC5 WWA Inverter type 3.55 1.5 54 1111 5 31860 1+10
19 Hitachi RAW318HFDOF Fixed speed 3.20 1.5 50 1161 3 29890 1+5
20 Daikin MTKL50U Inverter type 4.00 1.5 35 3 36990 1+10

All models had copper condenser tubes. Prices may vary therefore check current prices at or

Window Air Conditioners: A Buying Guide

Window Air Conditioners: A Buying Guide

There are various brands of air conditioners with large number of models focusing only on minor differences mainly in aesthetics, design, appearance, colour, shape and size, etc....

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