seer vs eer vs ieer

SEER, EER, and IEER, all these acronyms are used to determine the efficiency and performance of a cooling device. These ratings are significant while determining what cooling device is the most ideal that will have the best cooling impact. Electric bills or manual sheets have the values of these ratings.       

The ratings can help measure the efficiency ratio and the ratio of input and output of the device. Following is a guide that explains these acronyms in detail and what role each term plays for your cooling device.

What is EER

EER is the abbreviation for energy efficiency ratio. EER is used to calculate the efficiency and performance rate for air conditioners in your room. It supplies you with the ratio of output and input of the cooling device.

An air conditioner with a higher EER rating will deliver more cooling for every watt of energy used. That is why the term is called ‘energy efficiency ratio.’ The higher energy efficiency ratio of a cooling device shows the efficiency and performance of the device itself.

Is higher EER better?

The higher the EER, the better the deliverance and performance rate of the cooling device. The efficiency ratio is the ratio of the cooling ability to the energy input of the unit.

An Ac unit with a higher EER is more efficient and will deliver a more cooling effect. The most appropriate EER rating for cooling devices is 12. Ac units perform the best at this rating. However, several conditions affect the EER of the device. That is why while purchasing a cooling unit, the person must be aware of its EER.

Each cooling unit also has an energy efficiency ratio that helps in comparison. You can compare the performance and deliverance of each device. Choosing a cooling unit with a high EER is recommended. That is because a high EER rate helps with energy savings as the device is consuming low energy.

Such units are also more efficient in cooling and have better structure and features. Manufacturers make high EER units more heavy-duty, long-lasting, and sturdy.

What is SEER

SEER is the abbreviation for Seasonal Energy Efficiency Ratio. This term derives the rating of Ac’s conditioning capacity. SEER is the ratio of cooling output of AC in a standard cooling period divided by the electric energy the device consumes.

Seasonal Energy Efficiency Ratio measures the rating of the device throughout an entire cooling period.  The SEER of the device can be affected by certain conditions which lower the ratio. 

Is higher SEER better

The higher Seasonal energy efficiency ratio of a cooling device means that the device is more efficient. It is essential to have a cooling device with high SEER to spend hot summers with a practical cooling impact. That is especially significant for residents of scorching areas. That is why manufacturers incorporate variable-speed blower and 2-stage compressor that gives the device a high-efficiency ratio.

That will prevent the device from tripping in sweltering weather and also reduces humidity in your room. The higher SEER is also beneficial for savings as it reduces energy costs.

However, whether you should own a cooling unit with a low SEER or higher SEER depends on your area’s weather conditions. Low SEER can also provide good effect and delivery if your area’s climate is not hot and humid. On the opposite, higher SEER is the most suitable for comfort and efficient cooling.


It is essential to note that several other factors affect the ratio before determining the best SEER rating. These factors can range from the AC unit’s size or the location it is in.

The standard minimum rating of a cooling device is said to be 13 SEER. The SEER rating range of modern cooling devices starts from and ranges up to 21 SEER. 13 being at the lowest of the content doesn’t signify inefficiency. There are SEER ratings even lower than 13.

In comparison, the SEER rating of 16 is more efficient and better delivered. It will also reduce the energy cost and are better energy efficiency. That is because higher SEER means high efficiency. A better above 16 will mean higher coherence. But again, several factors affect and determine the most appropriate SEER rating for your cooling device.

What is IEER

Integrated Energy Efficiency Ratio or IEER is another term used to the energy efficiency of the cooling unit. EER vs. IEER, both acronyms stand for a different purpose. The integration of the efficiency ratio determines the main difference between the acronyms.

IEER measures the actual efficiency of the unit, which works at multiple levels of loads.  IEER ratio considers both partial and complete load efficiency. IEER requires the values of EER. Weighing the performance at different load levels determines the IEER rating.

What is a good SEER rating?

Any rating ranging from 13-21 is a good SEER rating for the HVAC. A rating below and above this range can also be suitable depending on other factors.

What is a good EER rating for an air conditioner

The average rating begins from 8.5. The 8.5 EER is used to determine the ideal rating of the EER. The AC unit you buy should not have an EER rating below.

The most excellent EER rating for an Air conditioner is said to be 12.

Devices can have an EER rating that is higher than 12. That is merely a number that is considered most efficient and effective.

EER ratings are the most appropriate room AC. Several other factors determine the overall coherence of the unit. But buying a unit close to the 12 EER is an intelligent move.

What is a good SEER rating for an air conditioner

Modern HVAC units come with a SEER rating that ranges from 13-21. A unit that has a SEER rating of any number between 13-21 is a good rating.

The fact is that both SEER and unit’s performance are directly proportional.

The higher rating of HVAC, the more efficient it is. There are also HVAC units with ratings below 13. These units are, however, lower-end and not modern.

Each unit also carries a SEER rating that works best. That is why you must consider several factors before determining the best SEER rating for your device.

SEER VS EER conversion

In an AC unit, the value of SEER will be greater than the value of the EER. If you want to convert the value of SEER into the importance of EER, use the following formula of conversion.

EER= -0.02 x SEER² + 1.12 × SEER

What is more important SEER or EER

Both the ratings, SEER, and EER are parallel. A unit with a higher SEER will also have EER and eventually higher efficiency. That is why it is hard to answer the question that which of them is better or important.

The truth is that both EER and SEER are important. EER rating is for room air conditioner and SEER for more central units.

SEER measures the efficiency for an entire season, and EER estimates the specific extreme hot weather. Both the ratios together determine the overall efficiency of the team. SEER measurement is more general, and EER is more standardized.

Is 21 SEER worth the money

A mentioned earlier, modern HVAC has the SEER range from 13-21. That is the best range of determining the most efficient unit. There are SEER ratings below 13 and 21, but factors such as the size of the location and the ducts’ situation determine the unit’s efficiency.

Purchasing the highest SEER rating of the AC unit may deliver inefficient performance if other factors are not ideal. But to answer the question, 21 being the highest in the range is likely to have the most efficient performance and will be worth the money. You will enjoy better energy savings, comfort, and durability.

A higher SEER rating is perfect for spending your summers with ease and good cooling.

What SEER does AC qualify for tax money

It is significant to qualify for energy tax money. Make sure the unit you are purchasing is eligible for this to claim the federal tax credit. The packaged cooling device should be 12 or 14 SEER for SEER AC units to qualify for tax money. Split System AC should be of 16 or 13 SEER to be considered eligible.


Before purchasing an AC unit, you must remember these three terms to know the device’s efficiency.

These ratios help you consider whether your purchase is worth the money and helps in energy-saving and coping with the extreme point of the season. All three terms are essential and significant on their own. They follow each other to maintain the overall efficiency and performance of your cooling unit. 

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