What is ISEER Rating and Best ISEER Rating AC in India 2021

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What is an ISEER Rating? What is the Best ISEER Rating AC in India in 2021?

If you are purchasing an air conditioner, there will be a label on the AC or on the refrigerator that says ISEER Rating. This is for consumers to calculate electronic energy efficiency and annual electricity use. We will simplify this rating so you can easily understand it.


ISEER mean Indian Seasonal Energy Efficiency Ratio and it is used for air conditioner and refrigerator or any other electrical device

ISEER Rating

ISSER Rating is used to give the Electronic device\’s star rating and is determined by taking the Cooling Seasonal Total Load (Amount of Heat Removed) and dividing it by the Cooling Seasonal Energy Consumption (1600 Hours in Yearly 23ºC to 43ºC )

ISEER Full Form

Full-Form of ISEER is Indian Seasonal Energy Efficiency Ratio

ISEER Calculation

ISEER = Cooling Seasonal Total Load/ Cooling Seasonal Energy Consumption

  •  (Year) (1600hours) 23c to 43c

ISEER Formula

ISEER=Cooling Seasonal Total Load (CSTL)/Cooling Seasonal Energy Consumption (CSEC)

  • EER Energy Efficiency Ratio and it is measured in British Unit BTU
  • BTU Mean When Your AC is Convert Hot Air into Cool Air in One Hour in Your Room with Ac Compressor Work

EER Formula

  • EER=BTU/Hour Power Input (W)0.293w1 BTU
  • EER= Amount of Heat Removed/Hour in Watt Amount of Power Consumed/Hour in Watt

At Related Humidity 50% and 26°C Inner and 45°C Out Door

EER Value for Air Conditioner (Currently ISEER Value is Used in India)

EER Value for Air Conditioner

Capacity of AC

Heat Extracted/Hours (W)

Power Consumed/Hour in W via Compressor

EER Value

1 Ton

3516 W

1200 W


1.5 Ton

5274 W

1500 W


2 Ton

7032 W

1900 W


  • A higher EER rating is good
  • EER = Cooling OutPut + (watts/Hr)/Power input + (watts/Hr)
  • Where 1 BTU/Hour = 0.293 Watts
  • Where 18000 BTU Mean 1.5 Ton Ac
  • 12000 BTU Mean 1 Ton AC
  • 24000 BTU Mean 2 Ton AC 
  • 1 Ton Ac = W (Heat Extracted/Hours)

COP full form is Coefficient of Performance

Cop Is calculated by Heat Removed by ac and divide by Supply Energy input

in simple language COP=Output/Input


  • Output Mean Heat Removed
  • Input means Work of Compressor  

Use of EER and ISEER



Temp Outdoor 35c Constant

Temp 24c to 43

Period Hours Basis

Annual Basis

Use Before Jan 2018

Use After Jan 2018

  • EER or SEER = Cop x 3.412
  • BEE is compulsory from 2010
  • If your ac or refrigerator is 5 stars in 2010 so there will be 1 star in 2018

Difference Between EER and ISEER Value

EER Value


Used Internationally

Indian Government Approved

Rated for Non-inverter AC

Rated for Inverter AC

Its Depend on Seasons (Hours)

Highly Depend on Season

Value Are Same Over The World

Depend on Indian Temperature Change

Less Accurate Than ISSER

Highly Accurate Than EER

If You Want To Know About Top 7 Best Air Conditioners in India (2021) – AC Buying 

Latest ISEER Value for AC in India 2021

ISEER Value for Window Ac And Split AC 2021

Star Rating







1 Star

2.50 – 2.69

2.50 – 2.69

2.70 – 2.89

3.10 – 3.29

2 Star

2.70 – 2.89

2.70 – 2.89

2.90 – 3.09

3.30- 3.49

3 Star

2.90 – 3.09

2.90 – 3.09

3.10 – 3.29

3.50 – 3.99

4 Star

3.10 – 3.29

3.10 – 3.29

3.30 – 3.49

4.00 – 4.29

5 Star

3.3 – More

3.30 – More

3.50 – More

4.50 – More


(2016 – 2017)

(2018 – 2019)

(2016 – 2017)

(2018 – 2019)

Which AC Has Highest ISEER Rating

Toshiba 1.5 Ton 5 Star Ac is currently the highest Isser Value Ac in India 2021, and it is imported, so it is costly.

These 5 AC are Available for purchase online and have a high ISEER Rating.

Ac Name

ISEER Value (Wh/Wh)

Toshiba 1.5 Ton 5 Star Inverter Split AC (RAS-18PKCV2G-IN)


Blue Star 1.5 Ton 5 Star Inverter Split AC (IC718YCTU)


Panasonic 1.5 Ton 5 Star Inverter Split AC 2020 Model, (CS/CU-NU18WKYW)


Daikin 1.5 Ton 5 Star Split Inverter AC (FTKG50TV16U/RKG50TV16U)


Hitachi 1.5 Ton 5 Star Inverter Split AC (CopperKASHIKOI 5100x RSB518HBEA.Z White)



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