2020 Reviews: Best Energy Efficient Window Air Conditioners

| Last Updated: March 26, 2021

Global warming is only getting worse, and we all can look forward to many more hot summers. In many parts of the country, you simply have to have an air conditioner in order to get by – but how do you avoid the high cost of electric bills an air conditioner will undoubtedly generate?

You invest in an energy efficient window A/C!

Read on to learn more about these awesome units.

Comparison Chart of the Best Energy Efficient Window Air Conditioners

  • Best Overall Offering
  • Can Be Installed By Just One Person
  • Both the Compressor and Fan Are Quiet With No Rattling
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  • Runner-Up Product
  • Has a Control Panel and a Remote Control Option
  • Will Work Well Even During “Brownout” Low Power Periods
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  • Second Runner-Up Offering
  • Great for Removing Humidity From the Air
  • Cools Room Quickly, Even on the Low Setting
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  • Best Energy Efficient A/C on Amazon
  • Runs Even When Your Utility Company Lowers the Power
  • Multiple Control Options, Both Remotely and on the Unit
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  • Best Choice for the Money
  • Fan Setting Will Tell You the Actual Temperature of Your Room
  • Not Too Loud, But Provides Good Background White Noise
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  • Best Small Efficient Window Air Conditioner
  • Has Two Cool Speeds and Two Fan Speeds
  • Easy to Install – Users Report it Takes Around Twenty Minutes
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  • Quietest and Most Efficient
  • Can Cool a Room Within Thirty Minutes
  • Has the Highest BTU a “Regular” Outlet Can Handle
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What Makes These A/C Units Energy Efficient?

These A/C units are energy efficient because they require less power to operate. Advances in A/C technology have enabled today’s window units to consume far less juice, yet still produce large amounts of cool air. Some units also “recycle” their cooling water, making it last a lot longer.

Other units use additional energy saving techniques, such as side panels that seal in the cooler inside air while also blocking the hotter air from outside. You will be impressed at how little your electrical bill increases when using one of these units.

Are All Energy-Efficient Window Air Conditioners The Same?

There is no straight answer to this question. The reality is that energy-efficient air conditioners exhibit few similar and few different properties. Energy-efficient window air conditioners differ from each other on the basis of energy rating. The higher the energy rating, the higher the efficiency. For example, a 12 EER window AC will consume more energy than a 13 EER window AC. 

On the contrary, the purpose of all energy-efficient window ACs is the same, which is to suck in the hot air and exhale out the cold air without increasing the cost. In fact, energy-efficient window air conditioners weigh less on the bill economy.

How to Choose an Energy Efficient Window Air Conditioner

There are a number of qualities you will want to consider when buying a window air conditioner:

Energy Efficiency

This is clearly the main reason you are looking into window units – to cool off without being slapped with a giant power bill or the high cost of implementing a central air conditioning system. Keep an eye out for a unit’s EER rating – that stands for Energy Efficient Ratio, which will be a good comparison point on this factor.


What good is an air conditioner if it does not cool you off? Get yourself a window unit that will consistently and effectively deliver cool air on a reliable basis, so you can turn it on and forget about it – and forget about being hot – completely.

Friedrich Chill CP06G10B 6000 BTU Window Air Conditioner looks great in the living room.

Ease of Operation

You need a window unit that is going to work well for you, not something you are going to have to constantly fiddle with to get it to the exact right temperature you are seeking. Set it and forget it with an air conditioner that has simple dials or setting systems.

Quick Take: Best Energy Efficient Window Air Conditioners

Review of the Best Energy Efficient Window Air Conditioners

Now that you know what to keep in mind, let’s check out some actual products!

Friedrich Chill Series CP06G10B Window Air Conditioner, 6000 BTU


  • Reliable
  • Remote Controlled
  • Sturdy and Well Built
  • Has a Dry Mode for More Humid Days
  • Oscillating Vent Provides a Cool Breeze


  • Difficult to Change Out the Filter
  • Friedrich Does Not Provide Good Customer Service

The Friedrich Chill CP06G10B 6000 BTU Window Air Conditioner is the premier choice when it comes to energy efficient window air conditioners. This unit has a high-efficiency rating, so you know you are getting the most bang for your buck. It is a solid option if you happen to have central air conditioning but do not want to spend the money to cool your whole house down at night when all you really need is a cooling unit for your bedroom.

Speaking of night time, this air conditioner will definitely not keep you awake – both the compressor and the fan on this bad boy are quiet and do not produce any rattling.

There are also a number of convenient features on this unit that will make your life quite a bit easier, such as a timer control, so you can set it to turn on right before you get home from work. It also has a removable chassis, so you can take the unit itself out for cleaning while leaving the case still sealed inside the window. Best of all, it is simple to install and can be done by just one person.

Bottom Line

The Friedrich Chill CP06G10B 6000 BTU Window Air Conditioner is the ideal product in this category. Its only drawback is that it can be a little complicated to change out the unit’s filter.  


  • Quiet
  • Easy to Use
  • Cools Rooms Quickly
  • Strong Cooling Capacity
  • Fan Has a Lot of Blowing Power
  • Good for Smaller Windows and Rooms


  • Instructions Are Difficult to Read
  • Included Insulation Foam is Not Effective

The LG LW8016ER 8,000 BTU 115V Window-Mounted offering is a small step behind the Friedrich Chill in efficiency, but only a very small step. This window unit has a number of awesome convenience features, including the option to close the outside vent to block unpleasant odors coming from outside.

It also has extra side panels to seal in cooled indoor air. The vent on this unit points upward, so if you have it in your bedroom, it will not blow cold air directly into your face, but will rather smoothly dissipate it throughout the whole room. It has both a direct control panel on the unit itself as well as a remote control so it can be adjusted from far away.

Best of all, it is energy efficient enough to work during “brownout” power periods – those times when utility companies lower the rate of provided power because of high outdoor temperatures and the associated risks. The energy saving mode will save you money and be easier on the environment as well.

Bottom Line

The LG LW8016ER 8,000 BTU 115V Window-Mounted unit is an awesome product with a number of handy convenience features to make your life easier. You may want to buy your own insulation foam for this unit, though.  

hOmeLabs 5000 BTU Window Mounted Air Conditioner - 7-Speed Window AC Unit Small Quiet Mechanical Controls 2 Cool and Fan Settings with Installation Kit Leaf Guards Washable Filter - Indoor Room AC


  • Quiet
  • Great for Smaller Areas
  • Durable, Will Last a Long Time
  • Filter is Easy to Remove and Clean
  • Great for Removing Humidity From the Air


  • On the Smaller Side
  • Does Not Have a Degree Setting or a Timer for Automatic Shutoff

The hOmeLabs 5000 BTU Window-Mounted Air Conditioner is an excellent unit for cooling off the room it is installed in. This unit is too small to cool off an entire house, but if you are looking for an energy efficient window air conditioner for your bedroom or your kids’ bedrooms, this is an excellent choice. It does not have a light, so it is great for nighttime cooling.

It has four settings – two fans, two air conditioning – and it cools the room quickly even when it is on the lowest setting. And do not think its effectiveness comes at the price of your electric bill – far from it. Users report that even when running this unit constantly during the hottest days of the summer, their electric bill increased by only $20! That is a small price to pay for consistent cooling.

Additionally, this unit is incredibly easy to operate: from installation to changing the filter, everything is simple and intuitive.

Bottom Line

The hOmeLabs 5000 BTU Window-Mounted Air Conditioner is an ideal unit for cooling off one room within your larger home. Because it is on the smaller side, it probably will not work well for cooling much beyond that.

LG 6,000 BTU 115V Window Air Conditioner with Remote Control, White


  • Easy to Use
  • Powerful Fan
  • Able to Rapidly Cool a Room
  • Does Not Make a Lot of Noise
  • Great for Windows That Are on the Smaller Side


  • Insulation Foam is Low Quality

If you are looking for a top-notch window air conditioner with convenient delivery an Amazon purchase, the LG LW6017R 6,000 BTU 115V Window Air Conditioner is the choice for you!

There are a ton of incredible features with this unit, including additional panels on the side of the unit so you can keep the cooler air inside your house, while also blocking any odors from outside, whether city fumes or country skunk stink.

The upward vent on this unit efficiently cycles the air throughout the room, instead of forcing it into one concentrated area. It can be controlled both remotely and with the control panel directly on the unit itself. Also, this unit really maximizes its energy efficiency – you will not have to worry about it crashing on a really hot day when your utility company lowers the power rates.

Bottom Line

The LG LW6017R 6,000 BTU 115V Window Air Conditioner is a great unit with some really incredible features. However, it may be worthwhile for you to stock up on your own insulation foam.

Best for the Money:
  Frigidaire FFRE0533S1

Frigidaire FFRE0633S1 6,000 BTU 115V Window-Mounted Mini-Compact Air Conditioner with Full-Function Remote Control


  • Easy to Install
  • Cools Off Rooms Quickly
  • Good for Smaller Rooms
  • Good at Reducing Humidity
  • On the Lighter Side, One Person Could Handle it Easily


  • Frigidaire Does Not Provide Good Customer Service

Our Review

The Frigidaire FFRE0533S1 is an excellent window unit for smaller rooms, with quite a few awesome features that will make your life significantly easier. It has a timer setting, which is convenient for use while you are sleeping at night and while you are away from the home during the day. The fan setting shows you the temperature of your room in real time, so you will always know when you need or want to adjust the setting

In “econ” mode, the unit will turn off whenever it reaches a certain temperature, which is excellent in terms of saved energy costs. If it annoys you to have the unit cycle on and off (we are thinking this could be a particularly frustrating issue at night), never fear! Just pressing the “mode” button will continue to keep the sound level providing ambient sound at a good level – not too loud. Best of all, this unit will save you a ton of money in electrical bills: it is estimated to increase your annual electric costs by only $37.

Bottom Line

The Frigidaire FFRE0533S1 is a fantastic unit that will effectively cool your room and save you money in the process. Just know that Frigidaire, as a company, can sometimes be difficult to deal with.   

Small Efficient Window Air Conditioner:
 Frigidaire FFRA0511R1

Frigidaire FFRA0511R1E 5, 000 BTU 115V Window-Mounted Mini-Compact Air Conditioner with Mechanical Controls


  • Quiet
  • Lightweight
  • Easy to Install
  • Cools Rooms Quickly
  • Compact Size for Easy Storage


  • Does Not Work as Well in Larger Rooms

Our Review

The Frigidaire FFRA0511R1 is a great window air conditioner for smaller spaces and is particularly awesome if you are looking for a window unit that can easily be removed and stored away in the winter and then reinstalled when the weather outside starts heating up again. Users report that this is an incredibly easy unit to install and uninstall – with the whole process only taking about twenty minutes in total.

Its compact size ensures it will not take up a lot of space in your garage or storage closet when it is not in use during the colder months. It is also small enough to be able to be mounted to a window without requiring an outside support bracket, so that is a little bit less work for you. It has two cooling speeds, two fan speeds, and two-way airflow director, so do not let the smaller size on this guy fool you – it is quite a versatile little unit.

Bottom Line

The Frigidaire FFRA0511R1 is an ideal window air conditioner if you are looking for something small that will still get the job done effectively. It will not work as well with larger rooms, but you would not be buying a small air conditioner for a larger room anyway.

Quietest/Most Efficient Window Air Conditioner: 
Koldfront WAC12002WCO

Koldfront WAC12003WCO 12000 BTU 115V Window Air Conditioner with Dehumidifier and Remote Control


  • Quiet
  • Easy to Install
  • Has a Remote Control
  • Well-Made of High-Quality Material
  • Even When on the Low Setting, it Still Produces a Lot of Cold Air (Just With Less Force)


  • Lowest Temperature Setting is 62 Degrees, Which May Still Be High for Some Users

The Koldfront WAC12002WCO is probably the most energy efficient air conditioner you will be able to find on the market today. It uses only 1000 watts, which means that if you kept it running continuously for an entire month straight it would still cost you less than $100 in energy bill increases, making it actually cheaper than a central air conditioning system.

And despite this extreme energy efficiency, it is also super-effective – it can cool a room within thirty minutes, and also cool down an entire house (though it will take a bit longer).

It has the highest BTU any regular outlet can handle, so if you are not interested in installing 230V outlets just to cool off during the summer, this is the unit for you.

Another reason this unit is particularly efficient and effective is its ability to seal the cool air inside of your home and ensure none of it is projected out. Similarly, none of the hot outside air is pulled in. And it is also great as a dehumidifier – users report it can remove pints of water per hour from the air!

Bottom Line

The Koldfront WAC12002WCO is probably the most energy efficient window air unit you will be able to find. It may not be as cold as some other units, though.   

Benefits of Investing in a Great Model

When it comes to air conditioners, you are going to want to go with quality, even if that means a price increase. Here’s why:


Window air conditioners can be one of the worst things in the world to repair – not only does it often take a specialized skill set to fix them, but by nature of the air conditioner not working, you are going to be drenched in sweat and cranky the whole time you are fiddling with your tools. Skip the stress and invest in a unit that will last a long time.

Compact Size

Window units are not exactly the most aesthetically pleasing component of a room – so the smaller the unit is, the better. Plus, smaller units are easier to install, remove, and store, if you are interested in packing your unit away during the winter months.

Convenience Features

There are a number of high tech bells and whistles on today’s fancier window units that can make your life a lot easier. Stuff like automatic timers, so the unit will kick on right before you go to work or kick off right after you fall asleep and remote control operation can really improve your air conditioning experience.


Energy efficient air conditioners are the way of the future – they will cut down on your energy costs while still effectively cooling your entire living space. Make sure you find yourself an air conditioner that will fit your specific window and room sizing needs and you will never have to worry about being hot again.

LG LW8016ER 8,000 BTU 115V Window-Mounted

People Also Ask

You have questions, we have answers. The answers to some frequently asked questions will clear out every doubt, if any, regarding this topic. So, have a look at some of the most commonly occurring questions to see if they clear out your confusion.

What is the Most Energy-Efficient Temperature For Air Conditioning?

The most energy-efficient temperatures for AC lie between 75 and 78 degrees Fahrenheit and can save energy up to 47%. Therefore, using air conditioners on these temperatures will keep your room cool and reduce energy consumption as well. 

If the room temperature is close to 78 degrees Fahrenheit, then attaining the cooling temperatures will be easier for the AC compressor. As a result, more energy will be saved.

How Much Will An Energy-Efficient Window Air Conditioner Save Me In Bills?

The deduction in billing costs varies with respect to the energy efficiency rating proposed by an energy-efficient window air conditioner. Broadly speaking, an energy-efficient window air conditioner can save energy up to 47% and cut down on your billing costs to a great extent, like about 20 to 25 percent. 

How Much Does it Cost to Run a Window Air Conditioner Energy-Efficient?

An energy-efficient window AC saves a considerable amount of money. You can make a rough estimation of how much energy-efficient window ACs cost per month. 

For instance, multiply the power your window AC consumes per hour with the used hours and then multiply by 30. The result would be the units that you have to multiply with the cost per unit charged in your country. The final answer will be the cost of the energy-efficient window AC for those particular hours per month.

What Does EER Actually Stand For?

EER stands for the Energy Efficient Ratio, a metric often used when describing smaller window air conditioners. The EER can help you compare two different models of air conditioners and determine which one will save you more energy.

How to Reduce Energy Cost When Using a Window Air Conditioner?

You can reduce energy costs when using a window air conditioner in much the same way as you would try to reduce energy costs in general – by simply keeping your home cooler so that you do not need to run the air as much. This can include strategies such as opening windows to let in cool air at night and in the mornings and using blackout shades during the day.

Are Window Air Conditioners More Efficient Than Central Air?

For smaller areas, yes, window air conditioners are more efficient than a central air conditioning system. Window air conditioners are great for apartments and smaller homes because they will ultimately save you money in the long run.

Are Window Units Efficient?

It really depends on each particular unit’s EER. Some window units like the ones described in this article are more energy efficient than others.

My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.