Including best-selling options from LG and Frigidaire.

By Amina Lake Abdelrahman
Updated July 30, 2020
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If your home or apartment doesn’t have central air conditioning, a window air conditioner is often a necessity during the summer. Unlike portable air conditioners and tower fans, these air conditioners don’t take up any floor space since they are mounted into your window. They’ll help keep you and your home at a comfortable temperature so you sweat less while indoors. 

Since there are so many different options out there, we scoured thousands of customer reviews to find the best window air conditioners for every budget and room size. And if you’re wondering where to buy window air conditioners online, retailers like Amazon, Wayfair, and Target all still have options in stock.

Here are the nine best window air conditioners for 2020: 

What size window AC do I need, and are they efficient?

When shopping for AC units, one of the most important things to consider is the size of the space you need it for. You’ll see a number called a BTU (aka, British thermal unit) that corresponds with how big of a room each appliance can effectively cool. Small rooms require fewer BTUs, while large rooms will need more, according to the U.S. Department of Energy

Most websites list how many square feet each air conditioner is capable of cooling, so it’s also helpful to know the dimensions of the room you’re installing it in. Picking a unit that is too small for your space will be inefficient at lowering the temperature, but on the other hand, picking one that has too many BTUs for your room means you’ll end up paying for more electricity than you really need. “Based on size alone, an air conditioner generally needs 20 BTU for each square foot of living space,” says the U.S. Department of Energy. “Other important factors to consider when selecting an air conditioner are room height, local climate, shading, and window size.”

What are the best features to look for in window ACs? 

You’ll also want to keep an eye out for certain features that make using your air conditioner easier and more convenient. For example, if you want to be able to turn your appliance on or off and change the settings without getting up—especially if you’re putting the AC in your bedroom—look for a unit that comes with a remote control. Some of these air conditioners even have special settings that come in handy for different needs, like energy-efficient power-saving modes, or sleep functions that raise the temperature a few degrees in the middle of the night once you’re already asleep.

For even more convenience, you might want to opt for one with extra technology features. Many customers love their “smart” window air conditioners, like Midea's U-shaped model (which has a super modern appearance). These types of savvy units have Wi-Fi capabilities, so they can be completely controlled from your smartphone through the brands’ designated apps. And if you have an Amazon Echo or Google Home, you can often use it to easily change your air conditioner’s settings. 

Keep reading to learn more about the best window air conditioners you can buy online in 2020.


$363 (was $390),

This top-rated Frigidaire window air conditioner has a built-in timer, sleep mode, and three different fan speeds—plus, the unit comes with a remote control so you can easily change the settings from your bed or couch. “I live in a small but adequate 700-square-foot one-bedroom cottage and wanted a unit that would cool the entire cottage but not break my budget,” wrote one shopper. “It's affordable, easy to install, looks nice, reasonably quiet, and cools the entire cottage easily without the use of fans to help circulate the air.”



As Amazon’s best-selling window air conditioner, this affordable unit from Midea is a great option if you need a no-frills unit to cool small rooms up to 150 square feet. It has seven different temperature settings and two fan speeds, all of which can be controlled by the dials on the front of the appliance or the included remote control. Despite its low price, this unit still comes with mounting hardware to make installation easier. Shoppers say setting it up was a breeze, especially since the appliance is so compact and lightweight. “It cools very nicely, is actually rather quiet, and the remote works well,” wrote one shopper. Another even called it “one of the quietest window air conditioners.” 


From $339,

With this sleek option from Midea, you don’t have to worry about your window air conditioner looking like an eyesore. This modern-looking unit can cool rooms up to 450 square feet in size without making too much noise, and it’s equipped with three different fan speeds and a sleep mode. Not only will it blend in nicely with any room’s decor, but it can also be controlled remotely over Wi-Fi with the MideaAir app, Amazon Alexa, and Google Assistant. But one of its best features is the U-shaped design, which (unlike many other units) gives you the flexibility to open and close your window while it’s installed. “Overall, I'm very happy with this unit, and it really is an innovative new take on something that hasn't changed much over the years,” wrote one shopper.



Complete with a mounting kit for easy installation and an extra-long power cable (since outlets can be scarce in small spaces), this window AC from HomeLabs is a great option for rooms up to 150 square feet. It has seven different temperature settings to choose from, and the fan can be set to either high or low speed. “This is the perfect little window AC,” said one shopper. “We live in a small townhome and the AC cools the living room (where the AC is located) and the rest of the downstairs area… We left it on the other day and came back about three hours later and the entire house was freezing!”



If you need to quickly cool down a large room or a small home, this heavy-duty Frigidaire unit is a great option since it’s designed for spaces up to 1,600 square feet. (Just remember that it needs a 230-volt electrical outlet.) Shoppers say that it blows out “icy cool” air. Plus, the convenient remote control makes it easy to change between the various options, which include an energy-saving function and a sleep mode. “This is the next best thing to having a central AC,” wrote one customer. Another added: “I placed this in my living room window and I can feel the cool [air] all the way in the front of the house.”


$405 (was $500),

This multifunctional AC from Perfect Aire works on a wide variety of window openings, even vertical, casement, sliding, and crank styles. Shoppers are extremely pleased with how well it cools down their homes, even if they’re using it in spaces larger than the recommended 450 square feet. “After hunting for a casement window unit for months, I decided on this one and couldn’t be happier with my decision,” said one reviewer. Another wrote: “The unit is quiet and moves a lot of cold air, enough so that this one window unit can keep our entire single-story, small ranch home tolerable on the hottest of days.”


$409 (was $490),

This modern-looking window air conditioner from GE is a great choice for anyone who is particularly concerned about noise. It has a super quiet operation—the “quietest in the industry,” according to the brand—so you’ll still be able to hear your favorite TV show while the AC is running. “My air purifier is louder than this unit at times,” said one customer. It also features an automatically dimming LED thermostat, which is beneficial for light sleepers. Even though it’s designed for areas up to 250 square feet, some reviewers note that they’ve found success with slightly larger rooms, too.



Thanks to its dual-inverter compressor, this LG window air conditioner will constantly adjust its speed so it can easily maintain temperature in a room up to 450 square feet—which saves even more energy in the end. It’s also equipped with Wi-Fi capabilities, so you can control it from anywhere in your home using your smartphone. “It blows out constant cool air the moment it’s turned on and keeps a very large room comfortable,” one reviewer wrote. “The quality is great, and for the size, it has a lot of cooling power and wide vents for maximum air flow. Even on really hot days, it cools the room fast.”



If you’re willing to spend a bit more on your next window AC, it’s worth investing in this LG unit that also functions as a heater. Perfect for that in-between weather as the seasons change, this two-in-one unit can be used as an additional source of heat (as long as the outdoor temperature is no colder than 45 degrees Fahrenheit). It’s designed for rooms between 500 and 800 square feet, and customers say that it keeps their homes at comfortable, consistent temperatures. “Works like a charm in both heat and cool modes!” wrote one shopper, while another added: “I was surprised at how quickly the unit cools the room off. I turn on the unit and usually within five minutes the entire room is nice and cool.” Just note that this air conditioner requires a 230-volt electrical outlet instead of the standard 115-volt outlets.