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Best Buy customers often prefer the following products when searching for efficient air conditioner.

Air conditioning is one of the most important electrical appliances in our lives. It is used during the summer to cool the indoor temperature and make it comfortable for people. The main purpose of an air conditioner is to maintain a constant temperature in the room where it is installed. Browse the top-ranked list of efficient air conditioners below along with associated reviews and opinions.

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  1. Honeywell - 400 Sq. Ft Portable Air Conditioner - White/Blue - Front_Zoom

    Product Description

    Honeywell portable air conditioner covers all the bases - AC and a multi-speed fan keep you cool in summer, a dehumidifier ensures your space stays dry during wetter, potentially mold-inducing months. This AC keeps you comfortable in rooms up to 400 square feet, covering more square footage than comparable models on the market. Designed with portability in mind. The Honeywell MO series is one of the lightest in its class and comes with smooth-gliding wheels that make sliding the unit from room-to-room a breeze. It's easy to keep your energy costs low when you're not wasting effort cooling down empty rooms. This Honeywell portable air conditioner comes with everything needed including a flexible exhaust hose and an easy-to-install window venting kit. The window vent can be removed when the unit is not in use.
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    Product Description

    Honeywell portable air conditioner covers all the bases - AC and a multi-speed fan keep you cool in summer, a dehumidifier ensures your space stays dry during wetter, potentially mold-inducing months. This AC keeps you comfortable in rooms up to 400 square feet, covering more square footage than comparable models on the market. Designed with portability in mind. The Honeywell MO series is one of the lightest in its class and comes with smooth-gliding wheels that make sliding the unit from room-to-room a breeze. It's easy to keep your energy costs low when you're not wasting effort cooling down empty rooms. This Honeywell portable air conditioner comes with everything needed including a flexible exhaust hose and an easy-to-install window venting kit. The window vent can be removed when the unit is not in use.
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    Your price for this item is $429.99
    See all Portable Air Conditioners
  2. LG - 330 Sq. Ft. 8000 BTU Through-the-Wall Air Conditioner - White - Front_Zoom
    Top comment

    "The air conditioner is super quiet and extremely energy efficient. ...It is quiet and energy efficient. It is exactly what I was looking for!...Great in wall air conditioner....Perfect air conditioner"

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    Product Description

    Our Energy Star certified 8,000 BTU Through-the-Wall Air Conditioner is ideal for cooling small to medium size rooms up to 340 sq. ft. It has 3 cooling and fan speeds to customize your comfort. The 4-way air deflection allows you to direct the flow of air where it's needed most whether cooling, dehumidifying or just circulating air. Use the convenient 24 hour on/off timer and energy saver option to help save on energy costs. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, trim kit, removable/washable filter and a check filter alert. (Wall sleeve sold separately)
    See all In-Wall Air Conditioners
    Top comment

    "The air conditioner is super quiet and extremely energy efficient. ...It is quiet and energy efficient. It is exactly what I was looking for!...Great in wall air conditioner....Perfect air conditioner"

    See all customer reviews

    Product Description

    Our Energy Star certified 8,000 BTU Through-the-Wall Air Conditioner is ideal for cooling small to medium size rooms up to 340 sq. ft. It has 3 cooling and fan speeds to customize your comfort. The 4-way air deflection allows you to direct the flow of air where it's needed most whether cooling, dehumidifying or just circulating air. Use the convenient 24 hour on/off timer and energy saver option to help save on energy costs. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, trim kit, removable/washable filter and a check filter alert. (Wall sleeve sold separately)
    See all In-Wall Air Conditioners
    Your price for this item is $400.99
    The previous price was $499.99
    See all In-Wall Air Conditioners
  3. Honeywell - 700 Sq. Ft. Portable Air Conditioner with Heat Pump - Black - Front_Zoom
    Top comment

    "Easy to use and efficient !! Just a bit noise. Overall very good...Great air conditioner...I bought this air conditioner to replace my old one that wasn't working that good. "

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    Product Description

    Stay cool and dry with this MN4HFS9 Honeywell Portable Air Conditioner with Heater. This unit combines 4-in-1 technology in one sleek body, cooling and dehumidifying areas up to 700 sq. ft. and heating areas up to 500 sq. ft. With cooling and heating functions in one, this appliance is useful year-round, keeping you cool during hot summers and warm during cold winters. It features an auto-evaporation system, a reliable dehumidifying function, and a traditional three-speed fan function to deliver optimum cooling, dehumidification, and fresh ventilation. The full-function remote control allows you to operate each feature from across the room. Unlike a fixed air conditioner, the Honeywell Portable Air Conditioner requires no permanent installation, and smooth-gliding wheels make sliding it from room to room a breeze.
    See all Portable Air Conditioners
    Top comment

    "Easy to use and efficient !! Just a bit noise. Overall very good...Great air conditioner...I bought this air conditioner to replace my old one that wasn't working that good. "

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    Product Description

    Stay cool and dry with this MN4HFS9 Honeywell Portable Air Conditioner with Heater. This unit combines 4-in-1 technology in one sleek body, cooling and dehumidifying areas up to 700 sq. ft. and heating areas up to 500 sq. ft. With cooling and heating functions in one, this appliance is useful year-round, keeping you cool during hot summers and warm during cold winters. It features an auto-evaporation system, a reliable dehumidifying function, and a traditional three-speed fan function to deliver optimum cooling, dehumidification, and fresh ventilation. The full-function remote control allows you to operate each feature from across the room. Unlike a fixed air conditioner, the Honeywell Portable Air Conditioner requires no permanent installation, and smooth-gliding wheels make sliding it from room to room a breeze.
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    Your price for this item is $679.99
    See all Portable Air Conditioners
  4. LG - 350 Sq. Ft. Portable Air Conditioner - White - Front_Zoom
    Top comment

    "They work as advertised are fairly quiet (as air conditioners go) and cool the spaces as needed....Air Conditioner...Very good air conditioner cools down my room amazing and fast great product"

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    Product Description

    This portable air conditioner is a great choice for versatile cooling! This quiet unit is ideal for cooling medium rooms up to 350 sq. ft. The unit has 2 cooling and fan speeds and a 24 hour timer to create a cooling schedule. The auto-swing air vent helps direct the flow of air where it's needed most whether cooling, dehumidifying or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Easy rolling casters allow you to efficiently move the unit to another location. Other features include an LCD remote control, easy window venting installation kit, removable/washable filter and a check filter alert.
    See all Portable Air Conditioners
    Top comment

    "They work as advertised are fairly quiet (as air conditioners go) and cool the spaces as needed....Air Conditioner...Very good air conditioner cools down my room amazing and fast great product"

    See all customer reviews

    Product Description

    This portable air conditioner is a great choice for versatile cooling! This quiet unit is ideal for cooling medium rooms up to 350 sq. ft. The unit has 2 cooling and fan speeds and a 24 hour timer to create a cooling schedule. The auto-swing air vent helps direct the flow of air where it's needed most whether cooling, dehumidifying or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Easy rolling casters allow you to efficiently move the unit to another location. Other features include an LCD remote control, easy window venting installation kit, removable/washable filter and a check filter alert.
    See all Portable Air Conditioners
    Your price for this item is $378.99
    The previous price was $399.99
    See all Portable Air Conditioners
  5. LG - 800 Sq. Ft. 15,000 BTU Smart Window Air Conditioner - White - Front_Zoom
    Top comment

    "Air conditioning...I bought this air conditioner about a month ago and it cooldown really good...This Air Conditioner works fantastic and as advertised. "

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    Product Description

    The LG LW1517ERSM is not only cool...it's SMART! Cool your home from anywhere using LG ThinQ technology to control your air conditioner with your phone or use with Amazon Alexa and Hey Google to have control with the sound of your voice. This quiet unit is ideal for cooling large rooms up to 800 sq. ft. and is Energy Star certified to help save on energy. The unit has 3 cooling and fan speeds and a 24 hour timer to create a cooling schedule. 4-way air deflection lets the flow of air be directed where it's needed most whether cooling, dehumidifying or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, easy window installation kit, slide-out (washable) filter and a check filter alert.
    See all Window Air Conditioners
    Top comment

    "Air conditioning...I bought this air conditioner about a month ago and it cooldown really good...This Air Conditioner works fantastic and as advertised. "

    See all customer reviews

    Product Description

    The LG LW1517ERSM is not only cool...it's SMART! Cool your home from anywhere using LG ThinQ technology to control your air conditioner with your phone or use with Amazon Alexa and Hey Google to have control with the sound of your voice. This quiet unit is ideal for cooling large rooms up to 800 sq. ft. and is Energy Star certified to help save on energy. The unit has 3 cooling and fan speeds and a 24 hour timer to create a cooling schedule. 4-way air deflection lets the flow of air be directed where it's needed most whether cooling, dehumidifying or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, easy window installation kit, slide-out (washable) filter and a check filter alert.
    See all Window Air Conditioners
    Your price for this item is $539.99
    See all Window Air Conditioners
  6. Whirlpool - 550 Sq. Ft 12,000 BTU 230V Through-the-Wall Air Conditioner with 10,600 BTU Heater - White - Front_Zoom
    Top comment

    "Through the wall air conditioner...Best & Powerful Wall Unit Air Conditioner...We purchased this wall unit air conditioner for our kitchen, living room and bedrooms which are all located on one level. "

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    Product Description

    Trust Whirlpool to help you care for your family and make your life easier. Our line of home comfort products keeps the climate inside your home just right - making the air comfortable, clean, and fresh. Whirlpool’s through-the-wall air conditioners are compatible with standard wall sleeves and offer a permanent cooling solution for areas of your home that are not connected to a central cooling system, saving you the hassle of summer installation then winter storage season after season. In addition, our heat/cool units provide supplemental heating to warm up the room on those unexpected chilly nights without heating the entire house. This heat/cool model offers 10,600 BTUs of supplemental heating and 12,000 BTUs of cooling for a room up to 550 square feet. It requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet. Take comfort and caring to the next level with Whirlpool.
    See all In-Wall Air Conditioners
    Top comment

    "Through the wall air conditioner...Best & Powerful Wall Unit Air Conditioner...We purchased this wall unit air conditioner for our kitchen, living room and bedrooms which are all located on one level. "

    See all customer reviews

    Product Description

    Trust Whirlpool to help you care for your family and make your life easier. Our line of home comfort products keeps the climate inside your home just right - making the air comfortable, clean, and fresh. Whirlpool’s through-the-wall air conditioners are compatible with standard wall sleeves and offer a permanent cooling solution for areas of your home that are not connected to a central cooling system, saving you the hassle of summer installation then winter storage season after season. In addition, our heat/cool units provide supplemental heating to warm up the room on those unexpected chilly nights without heating the entire house. This heat/cool model offers 10,600 BTUs of supplemental heating and 12,000 BTUs of cooling for a room up to 550 square feet. It requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet. Take comfort and caring to the next level with Whirlpool.
    See all In-Wall Air Conditioners
    Your price for this item is $649.99
    Price Drop
    The previous price was $749.99
    See all In-Wall Air Conditioners
  7. LG - 10,000 BTU Smart Window Air Conditioner - White - Front_Zoom
    Top comment

    "Great Air...My son was very please with how it cool his place also. Good air conditioners would purchase again...Very Efficient...[This review was collected as part of a promotion.] This air conditioner is easy to install, very efficient, and relatively quiet for its size. "

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    Product Description

    Stay cool on the hottest days with this 10,000 BTU LG window air conditioner. Its four-way air deflection ensures uniform distribution of air, while its energy-saver function intermittently shuts the fan off when the desired temperature is reached. The remote control on this LG window air conditioner lets you adjust the temperature from anywhere in the room.
    See all Window Air Conditioners
    Top comment

    "Great Air...My son was very please with how it cool his place also. Good air conditioners would purchase again...Very Efficient...[This review was collected as part of a promotion.] This air conditioner is easy to install, very efficient, and relatively quiet for its size. "

    See all customer reviews

    Product Description

    Stay cool on the hottest days with this 10,000 BTU LG window air conditioner. Its four-way air deflection ensures uniform distribution of air, while its energy-saver function intermittently shuts the fan off when the desired temperature is reached. The remote control on this LG window air conditioner lets you adjust the temperature from anywhere in the room.
    See all Window Air Conditioners
    Your price for this item is $389.99
    Price Drop
    The previous price was $439.99
    See all Window Air Conditioners
  8. Frigidaire - Energy Star 450 sq ft Window-Mounted Compact Air Conditioner - White - Angle_Zoom
    Top comment

    "GREAT AIR CONDITIONER, GREAT PRICE!!...I bought this air conditioner to replace an older model that wasn't efficient. ...Great air conditioner!...Great features, ice cold air, energy efficient. What more can you ask for?"

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    Product Description

    On hot, humid days, Frigidaire's Energy Star 10,000 BTU window-mounted air conditioner quickly cools a room up to 450 square feet. Ready-Select electronic controls allow you to set the comfort level to your preference, while a convenient temperature-readout displays the set temperature. Effortless temperature sensing remote control allows you to see, set and maintain room temperature from across the room. The multi-speed fan features three different speeds for cooling flexibility and the 6-way comfort control design allows you to easily direct the air where you want it. The washable filter with front, tilt-out access captures dust from the air to keep your air conditioner working efficiently. Plus, low power start-up conserves energy and saves you money. Year after year, Frigidaire is the brand you can trust to keep you cool and comfortable.
    See all Window Air Conditioners
    Top comment

    "GREAT AIR CONDITIONER, GREAT PRICE!!...I bought this air conditioner to replace an older model that wasn't efficient. ...Great air conditioner!...Great features, ice cold air, energy efficient. What more can you ask for?"

    See all customer reviews

    Product Description

    On hot, humid days, Frigidaire's Energy Star 10,000 BTU window-mounted air conditioner quickly cools a room up to 450 square feet. Ready-Select electronic controls allow you to set the comfort level to your preference, while a convenient temperature-readout displays the set temperature. Effortless temperature sensing remote control allows you to see, set and maintain room temperature from across the room. The multi-speed fan features three different speeds for cooling flexibility and the 6-way comfort control design allows you to easily direct the air where you want it. The washable filter with front, tilt-out access captures dust from the air to keep your air conditioner working efficiently. Plus, low power start-up conserves energy and saves you money. Year after year, Frigidaire is the brand you can trust to keep you cool and comfortable.
    See all Window Air Conditioners
    Your price for this item is $329.00
    See all Window Air Conditioners
  9. Frigidaire - Energy Star 350 sq ft Window-Mounted Mini-Compact Air Conditioner - White - Front_Zoom
    Top comment

    "Excellent air conditioner...[This review was collected as part of a promotion.] This air conditioner is very efficient with cooling. ...Awesome Air Conditioner...[This review was collected as part of a promotion.] I love, love, love my air conditioner. I live in an efficiency apartment and I am on a budget, but needed an air conditioner in the CT heat. "

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    Product Description

    On hot, humid days, Frigidaire's Energy Star 8,000 BTU window-mounted air conditioner quickly cools a room up to 350 square feet. Ready-Select electronic controls allow you to set the comfort level to your preference, while a convenient temperature-readout displays the set temperature. Effortless temperature sensing remote control allows you to see, set and maintain room temperature from across the room. The multi-speed fan features three different speeds for cooling flexibility and the 6-way comfort control design allows you to easily direct the air where you want it. The washable filter with front, tilt-out access captures dust from the air to keep your air conditioner working efficiently. Plus, low power start-up conserves energy and saves you money. Year after year, Frigidaire is the brand you can trust to keep you cool and comfortable.
    See all Window Air Conditioners
    Top comment

    "Excellent air conditioner...[This review was collected as part of a promotion.] This air conditioner is very efficient with cooling. ...Awesome Air Conditioner...[This review was collected as part of a promotion.] I love, love, love my air conditioner. I live in an efficiency apartment and I am on a budget, but needed an air conditioner in the CT heat. "

    See all customer reviews

    Product Description

    On hot, humid days, Frigidaire's Energy Star 8,000 BTU window-mounted air conditioner quickly cools a room up to 350 square feet. Ready-Select electronic controls allow you to set the comfort level to your preference, while a convenient temperature-readout displays the set temperature. Effortless temperature sensing remote control allows you to see, set and maintain room temperature from across the room. The multi-speed fan features three different speeds for cooling flexibility and the 6-way comfort control design allows you to easily direct the air where you want it. The washable filter with front, tilt-out access captures dust from the air to keep your air conditioner working efficiently. Plus, low power start-up conserves energy and saves you money. Year after year, Frigidaire is the brand you can trust to keep you cool and comfortable.
    See all Window Air Conditioners
    Your price for this item is $329.99
    See all Window Air Conditioners
  10. LG - 500 Sq. Ft. Smart Portable Air Conditioner - White - Front_Zoom
    Top comment

    "Highly Efficient and Quiet...[This review was collected as part of a promotion.] I’ve had portable air conditioners in my house for 11 years but had never before owned an LG. ...As powerful, efficient and quiet as claimed...We wanted a larger, quieter air conditioner and were put off by weight of a larger window unit. "

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    Product Description

    Beat the heat with this LG dual-inverter portable air conditioner. The built-in Wi-Fi lets you customize settings remotely for added convenience, while the built in wheels make it easy to move from room to room as needed. This LG dual-inverter portable air conditioner has three fan speeds for adjusting intensity.
    See all Window Air Conditioners
    Top comment

    "Highly Efficient and Quiet...[This review was collected as part of a promotion.] I’ve had portable air conditioners in my house for 11 years but had never before owned an LG. ...As powerful, efficient and quiet as claimed...We wanted a larger, quieter air conditioner and were put off by weight of a larger window unit. "

    See all customer reviews

    Product Description

    Beat the heat with this LG dual-inverter portable air conditioner. The built-in Wi-Fi lets you customize settings remotely for added convenience, while the built in wheels make it easy to move from room to room as needed. This LG dual-inverter portable air conditioner has three fan speeds for adjusting intensity.
    See all Window Air Conditioners
    Your price for this item is $699.99
    Price Drop
    The previous price was $739.99
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