Window Air Conditioners

Best Energy Efficient Window Air Conditioner (2026): Our 5 Picks Ranked

By HouseCostWise Editorial · Updated Oct 26, 2026 · How we pick

As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.

For an energy-efficient window air conditioner, the Midea leads this list: it is rated for up to 450 sq ft by the maker, runs at 32 dB, and carries ENERGY STAR certification with an inverter system. If you want a smaller room unit, the LG is rated for up to 250 sq ft by the maker and runs at 52 dB.

Starting out? See the main guide: Best Window AC Unit

Top picks at a glance

Best OverallMidea 10,000 BTU U-Shaped Smart Inverter Window
9.8 View on Amazon
Runner-UpLG 6,000 BTU Window Air Conditioner
9.7 View on Amazon
Also GreatGE 6,000 BTU Electronic Window Air Conditioner
9.4 View on Amazon
Also GreatTCL 10,000 BTU Smart Window Air Conditioner
9.3 View on Amazon
Also GreatWindmill 5,000 BTU Lite Window Air Conditioner
9.2 View on Amazon

Compare the specs

Ranked on cooling capacity, coverage (maker's figure), rated noise level, energy star, phone app control, remote control, inverter heating, eco / energy-saving mode from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.

Pick	Cooling capacity	Coverage (maker's figure)	Rated noise level	ENERGY STAR	Phone app control	Remote control	Inverter heating	Eco / energy-saving mode	Weight	Warranty
1. Midea 10,000 BTU U-Shaped Smart Inverter Window	10,000 BTU	450 sq ft	32 dB	Yes	Yes	Yes	Yes	—	56.9 lb	2-year
2. LG 6,000 BTU Window Air Conditioner	6,000 BTU	250 sq ft	52 dB	—	—	Yes	—	—	44 lb	1-year
3. GE 6,000 BTU Electronic Window Air Conditioner	6,000 BTU	250 sq ft	56 dB	—	—	Yes	—	Yes	38 lb	1-year
4. TCL 10,000 BTU Smart Window Air Conditioner	10,000 BTU	450 sq ft	54 dB	—	Yes	Yes	—	Yes	48.5 lb	1-year
5. Windmill 5,000 BTU Lite Window Air Conditioner	5,000 BTU	150 sq ft	51 dB	—	Yes	Yes	—	Yes	—	—

1. Best Overall9.8/10

Midea 10,000 BTU U-Shaped Smart Inverter Window

It pairs 10,000 BTU cooling with coverage rated for up to 450 sq ft by the maker, 32 dB operation, and ENERGY STAR certification.

Cooling capacity: 10,000 BTU
Coverage (maker's figure): 450 sq ft
Rated noise level: 32 dB, the lowest rated here
ENERGY STAR
Phone app control
Remote control
Inverter heating
2-year warranty stated

Check it on Amazon

Good for

Buyers who want a 450 sq ft room cooled by an inverter
Buyers who want app, Alexa, and Google Assistant control

Skip it if

You need coverage past 450 sq ft
You need a unit under 56.9 lb

It draws 890 watts and weighs 56.9 lb, with a U-shaped form that lets the window open for fresh air. The SmartHome app, Alexa, and Google Assistant control it from anywhere, and the quick-snap bracket fits single-hung or double-hung windows from 22 to 36 inches wide. It carries a 2-year warranty.

2. Runner-Up9.7/10

LG 6,000 BTU Window Air Conditioner

It pairs 6,000 BTU cooling with coverage rated for up to 250 sq ft by the maker, 52 dB operation, and a remote.

Cooling capacity: 6,000 BTU
Coverage (maker's figure): 250 sq ft
Rated noise level: 52 dB
Remote control
1-year warranty stated

Check it on Amazon

Good for

Buyers who want a 250 sq ft bedroom or den cooled
Buyers who want auto restart after a power failure

Skip it if

You need coverage past 250 sq ft
You need a unit under 44 lb

It draws 520 watts and weighs 44 lb, with a digital control panel, a remote, and 2-way air deflection. The washable filter slides out for cleaning, and a filter light reminder is included with a window installation kit. It carries a 1-year warranty.

3. Also Great9.4/10

GE 6,000 BTU Electronic Window Air Conditioner

It pairs 6,000 BTU cooling with coverage rated for up to 250 sq ft by the maker, 56 dB operation, and an ECO mode.

Cooling capacity: 6,000 BTU
Coverage (maker's figure): 250 sq ft
Rated noise level: 56 dB
Remote control
Eco / energy-saving mode
1-year warranty stated

Check it on Amazon

Good for

Buyers who want a 250 sq ft bedroom or home office cooled
Buyers who want an ECO mode and a 24-hour timer

Skip it if

You need coverage past 250 sq ft
You need a unit under 38 lb

It draws 530 watts and weighs 38 lb, with a digital thermostat from 64 degrees Fahrenheit to 86 degrees Fahrenheit and a remote. The ECO mode auto-cycles the compressor to hold the set temperature, and the 24-hour timer schedules on and off times. The washable filter has a reminder indicator, and it carries a 1-year warranty.

4. Also Great9.3/10

TCL 10,000 BTU Smart Window Air Conditioner

It pairs 10,000 BTU cooling with coverage rated for up to 450 sq ft by the maker, 54 dB operation, and a 3-in-1 design.

Cooling capacity: 10,000 BTU
Coverage (maker's figure): 450 sq ft
Rated noise level: 54 dB
Phone app control
Remote control
Eco / energy-saving mode
1-year warranty stated

Check it on Amazon

Good for

Buyers who want a 450 sq ft room with a fan and dehumidifier
Buyers who want app, Alexa, and Google Assistant control

Skip it if

You need coverage past 450 sq ft
You need a unit under 48.5 lb

It draws 870 watts and weighs 48.5 lb, with Sleep and Eco modes and a digital LED display. The TCL Home App, Alexa, and Google Assistant control it, and the remote works from the couch. The 3-in-1 design gives cooling, fan, and dehumidifier functions, and it carries a 1-year warranty.

5. Also Great9.2/10

Windmill 5,000 BTU Lite Window Air Conditioner

It pairs 5,000 BTU cooling with coverage rated for up to 150 sq ft by the maker, 51 dB operation, and 3 fan speeds.

Cooling capacity: 5,000 BTU
Coverage (maker's figure): 150 sq ft
Rated noise level: 51 dB
Phone app control
Remote control
Eco / energy-saving mode

Check it on Amazon

Good for

Buyers who want a 150 sq ft bedroom or home office cooled
Buyers who want app and voice control for a small space

Skip it if

You need coverage past 150 sq ft
You need more than 3 fan speeds

It gives 3 cooling modes, cool, eco, and fan, with 3 fan speeds and an easy-access washable filter. The Windmill Air app for iOS and Android controls it from anywhere, with voice control through smart home devices. The digital panel has auto-dimming LEDs, and the installation kit fits windows from 23 to 34 inches wide.

How to choose

Coverage as the maker's figure

Coverage is the figure each maker gives for room size, not a promise about every room. The Midea and the TCL are rated for up to 450 sq ft by the maker, the LG and the GE are rated for up to 250 sq ft by the maker, and the Windmill is rated for up to 150 sq ft by the maker. Compare that figure with your room's floor area before choosing, since a unit rated for a smaller room will not match a larger room.

Noise and controls

Noise is the stated decibel figure, and controls decide how you change temperature and mode. The Midea runs at 32 dB, the Windmill at 51 dB, the LG at 52 dB, the TCL at 54 dB, and the GE at 56 dB. The Midea, the TCL, and the Windmill work with an app, and the Midea, the TCL, and the Windmill also work with voice control. The LG and the GE work with a remote, and the GE adds a digital thermostat.

ECO modes

An ECO mode cycles the compressor to hold a set temperature. The GE has an ECO mode and a 24-hour timer that schedules on and off times. The TCL has Sleep and Eco modes, and the Windmill has an eco mode among its 3 cooling modes.

FAQ

Which unit covers a 450 sq ft room?

The Midea and the TCL are rated for up to 450 sq ft by the maker. The Midea runs at 32 dB and the TCL runs at 54 dB.

Which units have an ECO mode?

The GE has an ECO mode, the TCL has Sleep and Eco modes, and the Windmill has an eco mode among its 3 cooling modes. The Midea carries ENERGY STAR certification.

Which units work with an app?

The Midea, the TCL, and the Windmill work with an app. The Midea works with the SmartHome app, and the TCL works with the TCL Home App.

What noise levels do these units give?

The Midea runs at 32 dB, the Windmill at 51 dB, the LG at 52 dB, the TCL at 54 dB, and the GE at 56 dB.