there is a energy efficient window air conditioner in the bedroom

10 Most Energy Efficient Air Conditioners in 2021 (Review)

There are multiple appliances that that are must-haves in your house – from refrigerators, oven, washing machine, dryer, energy efficient water heaters, and especially during the summer, an air conditioner.

There are multiple models to choose from; however, it’s important to know that these devices can have electricity consumptions. Therefore, it is necessary to choose a model that optimizes electricity consumption and that still has the technical properties needed to cool down your home.

In this buying guide, you will find all the information that you need for choosing among the best energy efficient window air conditioners of 2021. Let’s dive deep into their technical specs and special features while also helping you to understand how to properly select one that is right for your specific needs.

The Best Energy Efficient Air Conditioners

1. Midea MAW06R1BWT Energy Efficient Window Air Conditioner

front facing midea maw06r1bwt energy efficient window air Conditioner

Key Features:

  • Eco-saver mode included
  • LED digital display
  • Functions: Cooling, dehumidification, and speed fan

Key Specifications:

  • Cooling Capacity: 6000BTU
  • Dimensions needed for installation: 23-36 x 15.5 x 16.02 inches (58.42 – 91.44 x 39.37 x 40.69 cm) (w x h x d)
  • Area cooling capacity: 150-250 sq.ft.

Where To Buy

The Midea MAW06R1BWT window air conditioners are an excellent choice for controlling the temperature of any room or living room.

This model uses three different technologies and mixes them into a single device. This energy efficient unit combines air conditioning, dehumidification, and speed fan modes into one, making it the perfect solution to increase the comfort of your home. It also has an Eco energy saving mode that shuts down the AC unit when your desired temperature is reached.

Moreover, this unit has a capacity of 6000 British Thermal Units (BTU) which is perfect for rooms up to 250 square feet, although it is also available in 10000 BTU and 12000 BTU for higher capacity needs.

This product also features a 24-hour timer with a sleep mode included and an LED display panel that will make things easier for you when changing settings.

2. LG LW6017R Energy Efficient Window Air Conditioner

front facing lg lw6017r energy efficient window air c
onditioner

Key Features:

  • Energy saver function available
  • Remote control
  • EER of 11.5

Key Specifications:

  • Cooling Power: 6000 BTU
  • Dimensions: 17.31 x 11.125 x 14
  • inches (43.97 x 28.26 x 35.56 cm) (w x h x d)
    Area capacity: 260 sq.ft.

Where To Buy

LG, a well-recognized brand in the world of electronics, brings the LG LW6017R energy efficient air conditioner with its cooling capacity of 6000 BTU, enough to control the temperature of a 260 sq.ft. room, such as a home office.

This model also features a dehumidification function that reaches up to 1.8 pints per hour. Moreover, the product has up to three cooling speeds and three fan speeds along with an auto cool function for temperature sensing. Among other interesting parameters, this LG small energy efficient window air conditioner has a nominal voltage of 115V, which means that can be connected to any 120V outlet. This product also has a 2-way air deflection, an energy efficiency rating (EER) of 11.5, and a combined energy efficiency rating (CEER) of 11.3.

In addition, this air conditioner also features an energy saving mode function that turns the A/C off after reaching a set temperature in order to reduce energy consumption and save money.

3. Frigidaire FFRA0511R1E Energy Efficient Window Air Conditioner

side facing frigidaire ffra0511r1e energy efficient window air conditioner

Key Features:

  • EER= 11.1
  • Estimated yearly energy consumption: 350kWh
  • Extension cord of 6.5 feet for easy installation

Key Specifications:

  • Cooling power: 5000BTU units
  • Dimensions: 15 x 16 x 12 inches (38.1 x 40.64 x 30.48 cm) (w x h x d)
  • Area capacity: 150 sq.ft.

Where To Buy

Frigidaire, another popular manufacturer, has developed the Frigidaire FFRA0511R1E window AC units to be perfect for cooling rooms with up to 150 square feet in area.

These energy efficient air conditioners feature dehumidification processes as well, with up to 1.1 pints per hour, and have a capacity of 5000 BTU units. The model also features other elements such as 2-cooling speeds, 2-fan speeds, and 2-way air direction. Among other things, the A/C operates in quiet mode and has a low power start-up.

Some of the technical parameters of the A/C unit include the energy efficiency rating (EER) which reaches up to 11.1 and is estimated to consume about 350kWh per year with average 3-month seasonal use.

The Frigidaire quiet window ACs also include a filter that has an antibacterial mesh side with slide-out access to clean and cool the air at the same time.

4. Della 048-TL-WAC6K

front facing della 048-tl-wac6k

Key Features:

  • Multiple modes: sleep mode, 24-hour timer, ECO mode, auto-mode, and fan-only mode
  • Runs quiet
  • Energy Star qualified

Key Specifications:

  • Power for cooling: 6000 BTU
  • Dimensions: 19 x 14x 16 inches (48.26 x 35.56 x 40.64 cm)(w x h x d)
  • Area capacity: 250 sq.ft.

Where To Buy

The Della 048-TL-WAC6K is another excellent choice if you are looking for an AC unit. It is an Energy Star- rated product with a high efficiency rating (CEER=12.2), making it one of the most energy efficient air conditioners in the market.

This model features a cooling power capacity of 6000 BTU, and although it is preferable for small rooms, it can easily cover a room size of up to 250 sq.ft.

Moreover, the Della quiet window ACs work with a noise emission that even when on high fan modes emit sounds as low as 55 decibels. Additionally, it is integrated with a dehumidifier with a capacity of 46 pints per day.

Among other interesting features, the Della window air conditioners have a variable temperature setting that can be set between 61°F – 88°F and can be adjusted by using the integrated LED digital display or remote control.

5. Frigidaire FFRA051ZA1

front facing frigidaire ffra051za1

Key Features:

  • Easy temperature settings
  • Washable filter
  • Quick cool and warm feature

Key Specifications:

  • Cooling power: 5000 BTU
  • Dimensions: 16.17 x 11.88 x 16.22 inches (41.07 x 30.17 x 41.2 cm) (w x h x d)
  • Area capacity: 150 sq.ft.

Where To Buy

Frigidaire also brings you the Frigidaire FFRA051ZA1 air conditioner which has been designed to provide quick cool down or warm up to any room. This is possible thanks to the quick cool/warm mode integrated into the product, capable of speeding up the fan according to user settings.

This inexpensive energy efficient window air conditioner has been designed with a temperature control system that maintains the room at the set temperature. Additionally, the unit features a clean filter that reduces bacteria, room odors, and similar airborne particles that keep the air quality of your room area at a high level.

Among other things, this model features adjustable side panels that can be extended to fit the window size and comes with a long three-prong power cord for a better reach.

This efficient air conditioner has a room cooling capacity of 5000 BTU, enough to keep a 150 sq.ft. room cool.

6. Koldfront WAC12001W

side facing koldfront wac12001w

Key Features:

  • Four-way air directional louvers
  • Energy-saving, sleep, only fan and dehumidifier modes
  • Energy efficiency rating 10.9

Key Specifications:

  • Cooling power: 12000 BTU
  • Dimensions: 22.6 x 16.1 x 23 inches (57.4 x 40.89 x 58.42 cm)
  • Area capacity: 400-550 sq.ft.

Where To Buy

The Koldfront WAC12001W is a remarkable state-of-the-art and energy efficient air conditioner definitely worth considering, especially ideal for rooms with 450-550 sq.ft. area.

This unit is designed for heavy duty use and is capable of providing 12000 BTU at a 1100W/5A rate for cooling purposes and 11600 BTU at a 3500W/16A rate for heating purposes (perfect as eco-friendly space heaters). The Koldfront model, as one of the most highly energy efficient window air conditioners on the market, has an EER of 10.9 and features an energy saver mode.

Moreover, the A/C unit includes a remote control ideal for convenience and has up to 4 operation modes including energy saving, fan only, dehumidifier, and sleep mode. You can also set the temperature by using the digital display and the digital thermostat.

Energy costs are estimated to be around $107, assuming average seasonal use. Keep in mind that the size is made to be installed in a large window.

7. Tosot 8,000 BTU Window Air Conditioner

front facing tosot 8,000 btu window air conditioner

Key Features:

  • Minimalist aesthetic
  • Remote control temperature sensor
  • Reusable filter

Key Specifications:

  • Cooling power: 8000 BTU
  • Dimensions: 23.8 x 19.6 x 14.6 inches (60.45 x 49.78 x 37.08 cm) (w x h x d)
  • Area capacity: 350 sq.ft.

Where To Buy

The Tosot 8,000 BTU energy efficient window air conditioner can make a cost-effective solution to heat during the summer season.

These units are equipped with an 8000 BTU capacity for cooling a room up to 350 sq.ft in area and a temperature control setting that is integrated into the remote control. This control feature allows you to cool the room based on the temperature that the remote is sensing, making it more intuitive at adjusting the temperature that you will actually feel. Sensors take a temperature reading every 10 minutes.

Among other things, the Tosot 8000 BTU room air conditioner features a sleep mode which makes the AC unit quiet and effective. However, the most interesting factor of this model is its clean minimalism that, unlike other models in the list, prioritizes aesthetics to provide an elegant touch to any room that it inhabits.

8. Koldfront WAC6002WCO

front facing koldfront wac6002wco

Key Features:

  • EER=12.1
  • Full function remote
  • Yearly energy costs: $49 assuming seasonal use and 8hr daily use

Key Specifications:

  • Power for cooling 6050 BTU
  • Dimensions: 15.8 x 18.6x 12.8 inches (40.13 x 47.24 x 32.51 cm)
  • Area capacity: 150-250 sq.ft.

Where To Buy

The Koldfront WAC6002WCO energy efficient window air conditioner units are designed with the capacity to provide up to 6050 BTU, powerful enough as to cool down a room size between 150 and 250 sq.ft.

Similar to other Koldfront air conditioning units, this model features a full function remote controllability with a 16ft. range and has a dehumidifier integrated. Also, as one of the most energy efficient window air conditioners available in the market, the Koldfront WAC6002WCO is an energy star rated product with an EER of up to 12.1 that integrates an energy saver mode.

Moreover, has three operation modes available such as: sleep mode, dehumidifier, and fan-only mode with 3 speeds. Thanks to its multiple operation modes, efficiency, performance, and comfortable size, these 6050 BTU window AC units have received many positive air conditioner reviews.

Keep in mind that to install a window air conditioner like this you will need to find a window that has between 22 to 36 inches wide along with a minimum height of 13-14 inches.

9. Frigidaire FFRE0533S1

front facing frigidaire ffre0533S1

Key Features:

  • EER=12.2
  • Washable mesh filter included
  • 4-way air direction

Key Specifications:

  • Cooling power: 5000BTU
  • Dimensions: 15.2 x 16 x 12 inches (38.6 x 40.64 x 30.48 cm)
  • Area capacity: 150 sq.ft.

Where To Buy

The Frigidaire FFRE0533S1 5000 BTU window air conditioner is an Energy Star rated product that has a high EER (energy efficiency rating) of 12.2 and the assurance of being certified according to US Department of Energy-approved UL standards. This model has received multiple positive air conditioner reviews, which can further put your mind at ease.

Due to their small size, these AC units are perfect for cooling small rooms, giving you up to 150 square feet of coverage. In addition, it’s easy to appreciate the Frigidaire quiet energy efficient window air conditioner during the overnight hours, as it works quietly and comfortably while you sleep without waking you up.

This model also features a convenient LED display and a full-function remote control to set temperatures to your comfort level. Furthermore, this 5000 BTU window air conditioner includes 4-way air direction capability that allows you to adjust air flow.

A washable mesh filter acts as another invaluable feature, reducing bacteria and increasing the air quality of a room.

10. hOmeLabs HME020003N

side facing homelabs hme020003n

Key Features:

  • Energy costs: $41 assuming average seasonal usage
  • EER= 11.1
  • Reusable antibacterial filter

Key Specifications:

  • Power for cooling: 5000 BTU
  • Dimensions: 16 x 15.4 x 12 inches (40.64 x 39.12 x 30.48 cm)
  • Area Capacity: 150 sq.ft.

Where To Buy

Reaching the end of our list, we have the hOmeLabs HME020003N window air conditioners. Designed with a higher efficiency rating than typical products in the market and with a capacity of up to 5000 BTU, it is ideal for cooling indoor rooms with up to 150 square feet of area. Its more efficient capacity makes it most suitable for smaller rooms.

Purchase includes an installation kit for mounting the window AC system, and includes support brackets, a foam insulation seal, and a reusable ecological filter that can be washed easily with warm water and dish soap.

These window AC units have up to 7 different temperature settings that offer you flexibility and a wide range of temperature possibilities. They also have a two-way air direction control and have the capability of adjusting fan speeds to quickly reduce hot temperatures in small rooms.

3 Key Features to Look for in an Energy Efficient Air Conditioner

there is a energy efficient window air conditioner in the living room

Cooling Power

The first thing that you want to look at is the capacity that the window AC unit has to cool things down. This parameter is provided using British Thermal Units (BTU) which represents the amount of heat that an air conditioner can remove from any room within an hour. The values for a BTU number vary typically between 5000 BTU and 15000 BTU for residential applications.

Finding the right BTU number for your situation is extremely important. Under-sizing can lead to the AC unit running continuously to try to cool down a large area, meaning a higher energy bill. However, installing unit that has BTU capacity too large for its area will mean that the air conditioner will means you will be paying more for something that a smaller unit could have done. In addition, oversizing can also lead to other problems such as moisture, low air quality, noise, and a higher wear and tear rate.

Therefore, it is extremely important to properly and accurately size your AC unit as we will explain in this buying guide.

Dimensions – Installation

Usually, window air conditioners are designed to be installed in standard double-hung windows or a sliding window. If you are thinking of installing it in a larger window, most air conditioners include side curtains to seal off the extra area on each side of any window. If you are looking to install it in the smallest window that you have at home, getting the correct dimensions is highly important The best approach is to carefully measure the window dimensions where the AC unit is to be installed.

Features and Operation Modes

Features and operation modes of the AC unit can tilt the balance in favor of or against the model. This refers to:

  • Fan speed adjustment
  • A remote control temperature sensor
  • An automatic timer
  • Sleep mode function
  • An energy-saving mode
  • Air direction control
  • A washable filter
  • Dehumidification and heating functions
  • Energy efficiency rating or combined energy efficiency ratin

What Makes These Air Conditioners Energy Efficient?

For an air conditioner to be considered an energy efficient unit, it must have the Energy Star label and it must have a specified energy efficiency rating (EER).

The EER represents the ratio of the cooling power (in BTU/hr) to the electrical power input (in watts) at 95°F/35°C. Basically, it provides a reference for how much cooling energy can be obtained from the unit based on a specific electrical power consumption. The higher it is, the more energy efficient it is.

Another parameter commonly used in this matter is the combined energy efficiency ratio (CEER) which is the new adoption (as of June 20140 made by the Department of Energy to categorize the efficiency of AC units. This considers both the energy used while the air conditioner is running, and the standby power consumed when the unit is not cooling but is still powered. Efficient window AC units should have at least an EER or CEER of 11.

Although SEER (Seasonal Energy Efficiency Rating) may be another parameter that you hear about, this is not applied to window AC units, but is used for central air conditioning measurements. The best energy efficient central air conditioner should have a SEER of 14 or higher.

What are the Most Efficient Air Conditioners?

If you are looking for the best energy efficient window air conditioners on this list, then look for one of the models from our top 5. These rankings consider the cooling capacity, the EER, and the room size as well.

Model

Cooling Power (BTU)

Room Size (sq.ft.)

EER

Frigidaire FFRE0533S1

5000

150

12.2

Koldfront WAC6002WCO

6050

250

12.1

Della 048-TL-WAC6K

6000

250

12.1

LG LW6017R

6000

260

11.5

Frigidaire FFRA0511R1E 5

 

5000

150

11.1

Table 1. Top 5 – Most Efficient Window Air Conditioners

How to Calculate What Size Air Conditioner You Need?

According to the U.S. Department of Energy, it is recommended to size the A/C unit by assuming 20 BTUs per square foot of living space. However, other factors also influence the thermal capacity of the air conditioner. For instance, the height of the ceiling is a reference for the volume of air that needs to be cooled. Also, sun exposure and the external ambient temperature of the location play an important role because these can increase or reduce the capacity needed by 10%.

As the thermal load increases inside a room based on the number of people that generally inhabit the area, it is also necessary to increase the BTU capacity (generally by 600BTU) starting with the third person inside the room.

Since these are all different variables, the most accurate way to find out your BTU requirements according to Energy Star standards is to use this BTU calculator. These sizing parameters can also apply to an energy efficient portable air conditioner, although they are less reliable due to high variations in the coverage area. Moreover, if you are thinking of installing a central air conditioning system, you must also adjust for air leaks and perform a periodic air quality test.

All of these considerations can be summarized according to Energy Star rating requirements by using the following table. It is important to know that despite the value shown on the calculator, you will need to adjust according to the available BTU standard values available in the market. Table 2 will give you a reference for these values along with the recommended cooling power according to the square footage.

Area to be Cooled (square feet)

Capacity Needed (BTU per hour)

100 up to 150

5,000

150 up to 250

6,000

250 up to 300

7,000

300 up to 350

8,000

350 up to 400

9,000

400 up to 450

10,000

450 up to 550

12,000

550 up to 700

14,000

700 up to 1,000

18,000

1,000 up to 1,200

21,000

1,200 up to 1,400

23,000

1,400 up to 1,500

24,000

1,500 up to 2,000

30,000

2,000 up to 2,500

34,000

Table 2. Air Conditioner Sizing According to Energy Star Standards. Source: Energy Star

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