In the figure, LLOYD Split AC having ISEER Rating of 3.72 has annual power consumption of 1049.79 Units or kWh. The accepted norm of an EER is, the 27 degree temperature inside the room, the 35 degree temperature outside the room, whereas the humidity is 50%. But it must be noted that, the electricity consumption mentioned on the name plate has been calculated based on certain parameters. Electricity consumption per year is also mentioned. If you see the name plate of AC, you will notice that value of ISEER is mentioned. Based on the value of ISEER, the STAR rating is given to ACs. In this method, the ISEER value is calculated for the entire year assuming the temperature profile for the year and 1600 operating hours of AC in a year. The better the value of ISEER, the better will be the efficiency of AC.īased on the concept of ISEER, a new methodology to rate the AC has been adopted. As the name suggest, it is seasonal energy efficiency ratio. This greatly helps in improving the energy efficiency. In inverter AC, the tonnage of AC varies with the heat load. This concept is introduced as the ambient temperature throughout the year varies and hence the cooling capacity of AC also varies to maintain a fixed indoor air temperature. The concept of ISEER was launched in India in 24th August 2016. ISEER = Cooling Capacity / Annually Power Consumed It is defined as the ratio of total amount of heat energy removed from the indoor air in a year to the total amount of power consumed annually. ISEER stands for Indian Seasonal Energy Efficiency Ratio. Indian Seasonal Energy Efficiency Ratio (ISEER): So if you see two 4 STARs ACs, one having EER value of 3.15 and another having 3.25, then you should go for second AC as its EER value is better. The better the EER value, the lower will be the power consumption AC and hence lower will be impact on you pocket. But what does this information mean to a consumer? Refer the table below for relation between STAR rating and EER for to Dec 31, 2015.įrom the above table it is clear that if EER lies in between 3.10 to 3.29, the AC will be given 4 STARs. Different STAR rating of AC has different value of Energy Efficiency ratio.īEE ( Bureau of Energy Efficiency) has set a standard to rate AC on the basis of EER.

Obviously, every consumer should look for better utilization of input power supply as it will help to reduce the electricity consumption and hence bill.ĮER of AC is a ratio of Cooling Capacity to the input power supply consumed. Thus cooling capacity is fixed by the tonnage of AC.Įnergy Efficiency Ratio or EER is a parameter which determines the utilization of input power supply to cool the room. Similarly, if we consider 1.5 Ton AC, the cooling capacity is 18000 BTU/hr, which means 5275 Watt approx. Since 1 BTU = 1055 Joule, therefore, cooling capacity of 1 Ton AC in terms of Watt will be For 1 Ton AC, the cooling capacity is 12000 BTU/hr.

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