Decoding the EER and SEER
Community Manager

The heat is here and it is showing no signs of letting up anytime soon. That’s why this is the best time to invest in an air-conditioner that does not burn holes in your pocket and is energy saving. However, buying an air-conditioner which cools efficiently & also saves energy could land up being a tough task. Let’s try and see if we can make it a little more of a cake walk.

To start, you would notice most Air Conditioners are assigned a star rating, but do you know what they mean? There are many terms brands use on most occasions, that we aren’t sure of and how they impact our life.


What is Star or energy efficiency Ratings?


Star ratings help buyers evaluate the energy efficiency of different models that have similar offerings.  For almost all air-conditioners, the minimum rating starts at 1 and maximum is 5. The ratings assigned to appliance make your buying decision easier.

Some retailers may have brands or products that are without a rating – all that means is that they are old models lying around for a long time and have great potential of shooting up your monthly electricity bill.


What are EER and SEER?

An Energy Efficiency Ratio rating measures the air-conditioner’s efficiency, whereas SEER rating measures the Seasonal Energy Efficiency Rating of an air-conditioner.

EER ratings are normally connected with smaller window AC units. The prevalent weather conditions have a bearing on the EER ratings and is measured with a constant outdoor temperature of 35 degrees Celsius along with an inside temperature of 26 degrees Celsius with humidity at 50%.

Details of the EER - In EER equipped Air Conditioners, the rating provides a basic understanding of the consumption power of the AC compressor and how it will affect your electricity bill. Changes in weather conditions have an impact on the outside temperature which in turn, also affects the room temperature. On your AC front panel, there may be two readings which indicate the outer as well as room temperature. For example, even if the temperature decreases in the external environment, the AC functions on the basis of a set temperature. Resultantly, the pulling power of the compressor doesn’t change.


The SEER rating measures the cooling power and applies to Air Conditioning. Also, SEER and EER use different measuring units to assign a rating to an Air Conditioner. While EER measures only constant temperature, SEER measures both variable as well as constant temperatures. SEER is most commonly used to compare AC units along with measuring consumption of large, central Air Conditioning units (such as Panasonic inverter AC’s) which perform better at a larger tonnage. These ratings are measured by evaluating the constant indoor temperature and a variable outdoor temperature ranging from 15 to 35 degrees Celsius.

In SEER Ratings, changes in seasonal temperatures are taken into consideration. For instance, if the ambient temperature changes from 28 degrees to 26 degrees, the room temperature which has been set at 20 will be to seem relatively cooler. Hence, AC’s with SEER ratings are great for users who live in areas that have constantly changing temperatures. The compressor automatically adapts to the outer temperature and reduces the pulling power, in turn, reducing electricity consumption.


Understanding these basics behind the rating system can make your buying decision much simpler and hassle-free.