The Best Window Air Conditioners of 2026

The Whirlpool WHAW-081IN is the pick to buy if you want the lowest 3-year cost we could verify on a window air conditioner with a genuinely high efficiency rating. Its 15.0 combined energy efficiency ratio (CEER) is confirmed in the EPA’s own ENERGY STAR certified product database, it ties the Friedrich Chill Premier Inverter CCV10C10A for the highest CEER on this list, and at $399.99 it undercuts every other CEER-15 unit we found once you add in the ENERGY STAR-rated electricity cost over 3 summers. Its Mute mode brings noise down to 42 dB.

If you just want the lowest sticker price and do not mind the loudest, least efficient unit on this list, the GE 8,000 BTU AHTK08AA is the budget pick at $257.40, though its 3-year running cost is now higher than the Whirlpool’s once electricity is added in. Anyone cooling a bigger room, roughly 400 to 450 sq ft, should look at the Friedrich Chill Premier Inverter CCV10C10A, a 10,000 BTU unit that matches the Whirlpool’s 15.0 CEER and adds a 5-year sealed refrigerant system warranty. The LG LW8017ERSM rounds out the list for anyone already using the LG ThinQ app for other appliances; LG does not publish a price on its own site, but Walmart currently lists it at $319.99.

How we picked

We scored each window air conditioner on 5 weighted criteria: cooling capacity and efficiency measured by CEER (30%), noise (20%), installation and fit (15%), controls and features (15%), and 3-year cost to own, meaning price plus electricity (20%). See the full scoring method at /how-we-score/.

For each unit we read the brand’s own product page or spec sheet: geappliances.com, whirlpoolhomecomfort.com, friedrich.com, and lg.com, plus retailer listings at bestbuy.com and walmart.com where a brand page left out a price. We cross-checked every CEER claim against the EPA’s ENERGY STAR certified room air conditioner database and queried the CPSC’s saferproducts.gov recall API for this product type on Sep 16, 2026. These are researched picks: we compared published specifications, ENERGY STAR certification data, and owner reviews, but we did not install or run any of these units ourselves. Full method at /how-we-score/.

What to look for

• CEER of 12.0 or higher. CEER folds standby power into the efficiency number, so it is a better real-world measure than the older EER rating. Anything under 11 will cost noticeably more to run over a summer.
• Sound level under 55 dBA on the low fan setting. A running refrigerator sits around 40 dBA, and normal conversation is about 60 dBA, so a unit rated above 55 dBA will be noticeable in a bedroom at night.
• Window width and height minimums. Fixed-chassis units typically need at least 22 to 24 inches of window width; U-shaped units need extra width, 23.5 inches or more, because part of the cabinet sits below the sash.
• Rated cooling watts. Two 8,000 BTU units can pull different wattage. A 30 to 40 watt difference adds up to real money over 3 summers, which is why we run the math in the cost-to-own box on every product below.
• Coverage area matched to your room, not oversized. An oversized unit cycles on and off more often, which can leave a room feeling clammy even though the thermostat reads cool.
• Dehumidification rate in pints per hour. This matters most in humid climates; 2 to 3 pints per hour is typical for an 8,000 to 10,000 BTU unit.

FAQ

What does CEER mean on a window air conditioner?

CEER stands for Combined Energy Efficiency Ratio. It divides a unit’s cooling output in BTU per hour by its total power draw, including standby power when the compressor is off but the unit is still plugged in. A higher CEER means more cooling per watt.

How many BTU do I need for my room?

Match the manufacturer’s stated coverage area to your room’s square footage rather than guessing from BTU alone, since coverage already accounts for ceiling height and typical insulation. The units on this list cover 250 to 450 sq ft depending on model; check each product’s specs below before you buy.

Will a window air conditioner still let me open my window?

Most fixed-chassis units, including every pick on this list, block the window opening completely once installed, since the cabinet straddles the open sash. A separate category of U-shaped units is built so the sash can close down over the top of the cabinet instead, which is worth a look if keeping the window usable matters more to you than the picks here.

How much does it cost to run a window air conditioner for a summer?

It depends on your local electricity rate, the unit’s rated watts, and how many hours a day you run it. We show the math for 8 hours a day at $0.17 per kWh over 3 years in the cost-to-own box for each product below, so you can compare units on the same basis before you shop.

Do window air conditioners need a dedicated outlet?

Most 115-volt window units of 8,000 to 12,000 BTU run on a standard household circuit, but check the amp draw on the spec sheet against your circuit’s breaker rating, especially if other appliances share the same circuit. If you are shopping for a portable unit instead of a window model, see our best portable air conditioners guide, and if humidity rather than heat is the bigger problem in your home, our best dehumidifiers guide covers standalone options.