Informational Guide

SEER to EER Calculator & Conversions

If you plan to buy a new air conditioner, always consider the energy efficiency ratings. Learn how to convert SEER to EER with our calculator & guide.

by Josh M

In the United States, about 6% of the total electricity is consumed by air conditioning systems.

Breaking this down further, nearly three-fourths of American households have AC units, which can be responsible for 12 to 27% of the total energy costs per month.

Therefore, it’s essential to have an efficient air conditioning and heat pump system to slash your monthly electric bill significantly.

To find which unit is more efficient and suitable for your household, look at the units’ EER and SEER ratings.

Read on if you want to know more about SEER to EER ratings and how to convert them:

SEER is a maximum energy-efficiency rating of air conditioning or heat pump systems. It stands for Seasonal Energy Efficiency Ratio or Seasonal Energy Efficiency Rating.

It’s the ratio of the cooling output (in British Thermal Unit BTU) and total power input (in wattages) over an average cooling season.

Look for a yellow and black rating sticker to find the SEER ratings of your air conditioners. Typically, it’s located within the condenser.

You can also use the following formula to calculate your air conditioner’s SEER rating:

SEER = Capacity x 1000 / Power x 1000

For example: Suppose, you have a 16,000 BTU cooling power air conditioner, which consumes 1000 W. Putting both values into the SEER equation will yield the following result:

SEER = 16,000 x 1000 / 1000 x 1000 =    16,000,000/1,000,000 = 16

How To Calculate The EER Rating Of My AC

EER is an acronym for Energy Efficiency Ratio or Energy Efficiency Rating. It measures the ratio of your unit’s cooling output (BTU) to electricity input (watts) during operation.

In short, it tells you how efficiently your HVAC system consumes power to take the heat away from the house or workplace.

High EER ratings mean the unit is efficient! You can find the EER ratings on a yellow and black guide sticker inside the condenser — the same place you found the SEER rating.

For calculating the EER ratings, use the following equation:

EER = capacity / power

For example: let us suppose you have an air conditioner with a 10,000 BTU cooling capacity using 1200 W. Put the values into the EER rating equation:

EER = 10,000/1200 = 8.3

How to Convert SEER to EER

EER ratings measure the energy efficiency at a fixed 95°F external temperature, 80°F internal temperature, 50% relative humidity, and 100% cooling load.

Whereas the SEER ratings measure energy efficiency over a complete cooling season (June, July, and August).

Nevertheless, here’s the equation you can use to convert EER ratings to SEER ratings, approved by the Air conditioning, Heating, and Refrigeration Institute (AHRI):

EER = 0.875 x SEER

SEER = EER / 0.875

For example: Let’s assume the EER rating is 8.3. Put this value into the SEER formula:

SEER = 8.3 / 0.875 = 9.4

In case you want to avoid all computations, you can use the EER ratings to SEER ratings conversion chart with ratings from 14 EER (16 SEER) to 34 EER (38.9 SEER).

EEER to SEER Rating

Consumers can also use the online converter to convert SEER to EER ratings when purchasing an air conditioner or heat pump. It’s simple to use: enter the SEER ratings, and you’ll get the EER ratings in return!

The SEER Efficiency Savings Calculator

Do you know your AC units’ monthly energy consumption? Well, it’s simple to find through the SEER savings calculator.

Calculating the SEER efficiency of your AC unit or heat pump will help you achieve efficient operation and save on electricity.

So, here’s how you can use the online savings calculator to find your air conditioners’ energy costs:

  1. .Select the tonnage of your AC unit from 1.5 to 5. You can calculate this by dividing the cooling capacity (in BTUs) with 12
  2. .Select the SEER rating of the unit you intend to compare from 8 to 30. You can find the SEER rating on the yellow guide sticker
  3. .Select the SEER rating of the new air conditioner you want to compare with your current one
  4. .Input the electricity cost charged in your region
  5. .Lastly, input a figure detailing the number of hours your air conditioner will be expected to operate each cooling season, and that’s all – you’ll have your actual savings per year and even for 20-years

More HVAC Conversions


KW/ton is a metric used to measure an HVAC system’s energy performance. It’s a ratio of peak power (KW) to peak cooling intake (tons). It is used mainly for industrial and commercial air conditioning systems.

With that said, here’s the formula to convert SEER to KW/ton:

EER = 12 / KW/ton

KW/ton = 12/EER

While we know the EER rating is equal to 0.875 x SEER, we will put this EER formula into the KW/ton equation:

KW/ton = 12/ 0.875x SEER

Remember, lower KW/ton suggests higher efficiency!


COP stands for coefficient of performance. It’s a ratio of the heat removed from the cold reservoir to work done for removing the heat.

To convert SEER ratings to COP ratings, the equation is:

EER = 3.41 x COP

COP = EER / 3.41

As EER is equal to 0.875 x SEER; putting it into the COP equation will yield the following result:

COP = 0.875xSEER / 3.41

People Also Ask (FAQ)

What Is More Important, SEER Or EER?

Both ratings are important. For regions where it’s 95°F or higher, the EER rating is essential since it’s more accurate; however, the SEER rating is given more importance in milder climates.

What Is A Good SEER For New AC Systems?

16 is considered a good SEER rating for new air conditioning systems.

What Is The Minimum SEER Rating For Energy Star Certified Products?

14.5 is the minimum SEER rating for an HVAC system that is energy-star certified.

What SEER Is Considered High Efficiency?

Anything above SEER 16 is considered high efficiency.

How Much More Efficient Is A 16 SEER Vs. 14 SEER?

The 16 SEER air conditioning systems consume approximately 13% less power than 14 SEER; this translates into significant savings.


Energy efficiency ratings of AC and heat pump units are vital to know if you want efficient cooling or heating while keeping the energy bills low.

Don’t forget, high EER and SEER ratings indicate higher energy efficiency performance and more savings.

Josh M

My name is Josh and I am obsessed with the HVAC industry. I created this website to help HVAC techs of all levels get the best out of their heating & cooling systems. I have spent thousands of hours studying air conditioners, heaters and home air products so you can learn & buy with confidence. Learn more about the team here.