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Indian Seasonal Energy Efficiency Ratio
Nov 04, 2016

What is it:

It is a new star rating methodology called Indian Seasonal Energy Efficiency Ratio (ISEER) for air conditioners. This evolved rating methodology factors in variance in higher temperature in India and rates air conditioners accordingly. Consumers can now purchase air conditioners with higher efficiency leading to lower electricity bills. Consumers can now purchase air conditioners with higher efficiency leading to lower electricity bills. 

How is it different:

♦ Keeping the performance of air conditioners during higher temperature in mind, ISEER will address the different climatic zones in India and higher temperature. ISEER measures energy efficiency of air conditioners based on a weighted average of the performance at outside temperatures between 24 and 43-degree C based on Indian weather data. 
♦ Rating system will bring in higher energy efficiency of appliances and reduce energy consumption. 


BEE has from the beginning worked out a plan of progressively improving the efficiency of Room AC from 2008 and to transform market towards better energy efficiency standards, BEE continuously tightens the standards such that, the Star-5 in 2010 became Star-3 in 2015 and will become Star-1 in 2018 as per new ISEER methodology. The weighted average Energy Efficiency Ratio (EER) of AC has increased from 2.6 in 2006 to 3.26 in 2015, which is an increase of 25% in efficiency due to tightening of standards. 

Since 2010 Bureau of Energy Efficiency has mandated air conditioners as a mandatory-labelled appliance under Energy Conservation Act and since then air conditioners cannot be sold without star label. Now as per latest notification, from January 2016, Star-2 is the least efficiency level to be sold in the market, hence variation in power consumption is compared between Star-5 (most efficient) and Star-2 (least efficient) air conditioners. 

How ISEER calculated

SEER is the ratio of the 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.

The method of evaluation of ISEER is based on bin hours of national climatic zone, bin temperature range of 24 - 43°C and 1600 operating hours for cooling per annum.  Table 1 displays bin hours against each bin temperature.

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