what is a good eer rating for an air conditioner

Air Conditioner EER Chart: Which AC Unit Is The Most Energy Efficient?

We can all agree that having a good air conditioner is invaluable. Nobody wants to face the summer heatwave without something to cool the house down.

About 6% of our yearly electricity bill goes to a single device – the air conditioner. It would make sense to get the most out of an air conditioner, right?

That’s precisely the point of an EER rating (it stands for Energy Efficiency Rating). The higher the EER rating an air conditioner has, the more energy-efficient it is. In short, if you want to save up to $100 per year on electricity, you should look for air conditioners with high EER ratings.

What is a good EER for a portable air conditioner?

The average EER rating for a portable air conditioner is 8.5. The eco-friendly portable AC can reach an EER rating 10. The most efficient portable AC – Whynter ARC-14S 14,000 BTU – has the top EER rating of 11.20 (#1 pick on the list of the best portable AC units). Such energy efficiency is achieved by the dual-hose Whynter system.

Some window air conditioners can achieve an EER rating of 12+. Anything above that should be considered great energy efficiency. In fact, the most energy-efficient window AC unit – LG LW1019IVSM – has an incredible EER rating of 13.8 (#1 pick). The reason why it can achieve such a high EER rating is LG’s dual inverter compressor.

EER Chart With Respective AC Electricity Costs

Here is an EER chart of how much does it cost to run a 10,000 BTU air conditioner (be it window unit, or any other). For the yearly energy bills, we’ve taken into account that the AC unit is running 8 hours per day for 3 months with the price of 1 kWh being 13 cents:

yearly electricity costs of running a window air conditioner vs eer rating

You have air conditioners with EER 8 or EER 10 or EER 12 or even EER 14. Do you 100% need the EER 14 or would EER 10 suffice? That’s exactly what the air conditioner EER chart will try to illustrate.

What Is A Good EER Rating For An Air Conditioner?

Most manufacturers will provide the EER rating themselves. Even if they don’t, you can calculate it yourself just by knowing two metrics – the BTU number and the measure of power (how many watts of power your AC unit has).

Example: If a 10,000 BTU air conditioner is powered by 1,000 W, the EER rating is calculated as

EER = 10,000 BTU / 1,000 W = 10 EER rating

In this EER chart, we will look at how much electricity (power in W) does a small 6,000 BTU, medium 10,000 and 14,000 large portable air conditioner use. We also calculated the EER rating for each AC unit:

EER Rating For Portable Air Conditioner (Examples)

BTU:Power:EER Rating:
6,000 BTU
(Small Portable AC)
400 W15
6,000 BTU
(Small Portable AC)
500 W12
6,000 BTU
(Small Portable AC)
600 W10
6,000 BTU
(Small Portable AC)
700 W8.57
6,000 BTU
(Small Portable AC)
800 W7.5
6,000 BTU
(Small Portable AC)
1000 W6
10,000 BTU
(Medium Portable AC)
600 W16.67
10,000 BTU
(Medium Portable AC)
800 W12.50
10,000 BTU
(Medium Portable AC)
1000 W10
10,000 BTU
(Medium Portable AC)
1200 W8.33
10,000 BTU
(Medium Portable AC)
1400 W7.14
10,000 BTU
(Medium Portable AC)
1600 W6.25
14,000 BTU
(Large Portable AC)
1000 W14
14,000 BTU
(Large Portable AC)
1200 W11.67
14,000 BTU
(Large Portable AC)
1400 W10
14,000 BTU
(Large Portable AC)
1600 W8.75
14,000 BTU
(Large Portable AC)
1800 W7.78
14,000 BTU
(Large Portable AC)
2000 W7
14,000 BTU
(Large Portable AC)
2200 W6.36

Which AC Units Have The Highest EER Rating?

In the chart above, we’ve looked at the EER rating of portable air conditioners. Obviously, there are several different types of air conditioners and each of them has a rough EER rating interval.

If you check out the several air conditioners EnergyStar has highlighted here, you will notice that the highest EER rating is 14.

When you find an air conditioner with a 14 EER rating, you need to look no further as far as energy efficiency is concerned.

Another important energy-related metric that you should know about air conditioning is the SEER rating. The EER is most valuable for portable AC units while the SEER is most valuable for split-system air conditioners.

You can read our article about the air conditioner SEER rating here.

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