Buying guide for best window air conditioner
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Central air conditioning isn't the best option for every dwelling. Sometimes, it's more cost-efficient (and energy-efficient) to invest in a window air conditioner that just cools the room you’re in — bedroom, office, family room or wherever you happen to be. To get the most for your money, it’s wise to research the best window air conditioner for your situation.
At BestReviews, we take shopping seriously. That's why we researched, evaluated and listened to customer feedback on over 50 models to gain solid knowledge of what’s available. To find the best for your home, you must first understand how powerful the unit needs to be and which features would provide the most comfort. You may also want to consider a window air conditioner's energy efficiency and any bells and whistles that come with it, such as smart operation.
Our top pick is the LG 10,000 Btu Smart Wi-Fi Enabled Window Air Conditioner. It suits rooms up to 450 square feet and can save you money on your energy bill.
Which window air conditioner is best?
Performance: 12,000 Btu with inverter compressor | Coverage: Cools and heats rooms up to 550 sq.ft | Convenience: LED display, electronic controls, remote control, SmartHome app | Noise Level: 45 dBA for ultra-quiet performance
This AC is like having a full climate command center packed into your window. It cools and heats with surprising versatility, and the smart features let you tweak temps from the couch, your car or even mid-conversation with Alexa.
We especially like the quiet operation. It hums along so softly that you’ll forget it’s even running. Just be aware that the heating mode taps out if the outdoor temp dips too far. Still, for year-round comfort with minimal hassle and strong energy savings, this unit checks a lot of boxes.
Performance: 5,000 Btu cooling power with 2 fan speeds | Coverage: Best for small spaces up to 150 to 250 sq. ft. | Convenience: Includes Auto Restart, washable dust filter, extra-long power cord, and adjustable side panels | Noise Level: low noise level of 52 dB
If you need a no-frills cooling solution for a smaller room, the Frigidaire 5,000 Btu unit checks the right boxes. It’s simple, affordable, and easy to install, even coming with everything you need out of the box. The temperature stays fairly consistent thanks to the Effortless Temperature Control feature, and the 52 dB noise level keeps the hum in the background where it belongs.
Just note that cooling performance and build quality can vary by unit. It’s a solid pick for keeping a small room cool without overspending or overcomplicating things.
Performance: 5,000 Btu cooling capacity with 2 fan speeds | Coverage: Designed for rooms up to 150 sq. ft. | Convenience: Intuitive controls, a washable filter, and an adjustable window installation kit | Noise Level: Up to 56 dB
If you're outfitting a small space and need a no-nonsense air conditioner, this Amazon Basics 5,000 Btu unit is a practical option. It covers rooms up to 150 square feet and includes both cooling and fan modes, along with simple dial controls that anyone can use. The washable filter is easy to access and helps keep your air a bit fresher.
Installation is straightforward, especially with the included adjustable side panels. While cooling performance is generally reliable, some users note it may take a while to bring down the temperature, and the noise level is a toss-up depending on the unit you get. It's not fancy, but it’s functional for the price.
Performance: 5,000 Btu cooling capacity with 7 temperature settings | Coverage: Best suited for small rooms under 150 sq ft. | Convenience: Mechanical knob controls, removable and reusable air filter, and a 6.23-foot power cord | Noise Level: Operates at 57 dB
This is a great little unit for small spaces like bedrooms or home offices. It keeps things simple with manual controls, and users love the compact size and how well it fits older or narrow windows. Cooling performance is generally solid for a room under 150 square feet, and installation is straightforward with the included hardware.
Customers also report lower utility bills, which is always a plus. That said, reviews on noise and longevity are mixed. Some find it whisper-quiet and long-lasting, while others mention rattling noises and early breakdowns. Still, for the price, it offers a solid cooling solution.
Performance: 6,000 Btu cooling capacity with custom temperature settings |Coverage: Best for bedrooms or small rooms up to 250 square feet | Convenience: Includes a remote control, washable dust filter with a clean filter alert, and intuitive electronic controls | Noise Level: Operates at a quiet 51 dB
The Frigidaire 6,000 Btu Window Air Conditioner is a compact unit with features designed to make your space more comfortable with minimal effort. Most customers praise its easy installation and appreciate the included window kit and remote control. The filter maintenance alert and energy-saving modes are thoughtful touches for daily use.
It's quiet enough for bedrooms, though noise tolerance varies depending on the user. Cooling performance earns solid marks in smaller rooms, but it can be underwhelming in hotter climates. Still, between the easy installation and quiet operation, it's a solid choice for the price.
How we chose the best window air conditioner
Our search for the best window air conditioners required many hours of research and consulting. The BestReviews team considered 50 models and evaluated the customer experience of 60 individuals. We researched desirable features and studied the metrics used to express performance. After compiling and scrutinizing the data, we picked eight top window air conditioners, purposely including a variety of models so you could quickly find the best one regardless of your needs.
What to know before buying a window air conditioner
Assessing your cooling needs
Window air conditioners have different cooling abilities. Some are made for large spaces, such as a family room, while others are made to operate in small spaces, such as a bedroom. If a window air conditioner is too small for the space, it will run constantly and possibly never get the room down to a comfortable temperature. If it’s too big, it will turn on and off quicker than the manufacturer intended — the cooling cycle should last 15 to 20 minutes — and put additional wear and tear on the unit.
The cooling power of an air conditioner is expressed in British Thermal Units, or Btu. The higher the Btu, the more cooling power it has. To get the right air conditioner, you need to know the square footage of a room. You can easily figure this by multiplying the length by the width of the space. For example, a room 20 feet long by 12 feet wide would be 240 square feet. To get a rough estimate of the needed Btu power, multiply the square footage by 25. In this example, 240 times 25 gives us 6,000. This means a 6,000-Btu air conditioner like the LG from our list would be the right fit.
It is important to realize that hotter climates, poorly insulated rooms, open doors and south-facing rooms require a higher Btu rating. Add roughly 10% for each of these factors to get more accurate results.
Energy efficiency and cost considerations
There are two ways the energy efficiency of an air conditioner is measured: the Energy Efficiency Ratio (EER) and Seasonal Energy Efficiency Ratio (SEER). Both EER and SEER involve dividing a unit's Btu rating by its input wattage.
For instance, if a unit had a 5,000-Btu rating and needed 500 watts, the ratio would be 10 (5,000 divided by 500).
The rating systems differ because the EER is only calculated when the outdoor temperature is 95 degrees. The SEER, on the other hand, is an average over the entire season. It uses temperatures ranging from 65 to 104 degrees. The higher the number (in either case), the more efficient the air conditioner is. Ideally, you want to find a window air conditioner with an EER of 10 or above. If you use the SEER rating, strive for 16 or higher.
While many factors are involved, such as climate and usage patterns, you could save anywhere from 10% to 40% in operating costs with a higher SEER number. For example, upgrading to an air conditioner with a SEER of 14 could save you 10% to 20% in energy costs. Moving to a model with a SEER of 19 could potentially knock up to 40% off your energy bill. So, the savings are significant. However, it’s important to understand that the more energy-efficient an air conditioner is, the more it costs upfront. To get what is right for you, weigh the purchasing cost against the operational cost.
If you don't want to worry about these calculations, that’s okay. Just look for an Energy Star-certified window air conditioner. This means the unit uses 8% less energy than conventional models.
Our top picks: Energy efficiency and cost considerations
- Frigidaire 15,100-Btu Window-Mounted Air Conditioner: According to Energy Star, this Frigidaire window air conditioner uses 10% less energy than the U.S. Federal Standard, making it a decent option for saving energy.
- Frigidaire 5,000-Btu Window-Mounted Air Conditioner: If lowering energy costs is your priority, this model isn't the best option. It operates at just below standard efficiency.
- Midea 8,000-Btu U-Shaped Smart Inverter Air Conditioner: With a SEER rating of 15, this model is just shy of being called a high-efficiency air conditioner. If you want an energy-efficient model, this is one of the best choices on our shortlist.
- Midea 5,000-Btu EasyCool Air Conditioner: While this air conditioner has a lot of good things, an efficient energy ratio isn't one of them. This model is best for people who need a small window air conditioner for a low price.
- LG 6,000-Btu Window Air Conditioner: In terms of energy efficiency, this one sits in the middle of our top five. It's not great, but it's not the worst option.
Window specifications and installation requirements
Unlike portable air conditioners, which can be adapted to fit various window designs, a window air conditioner can only be used in a double-hung window — one with windows that slide up and down. You cannot install a window air conditioner in a window that slides from side to side or cranks open. Also, the air conditioner must be small enough (in both width and height) to fit comfortably through the window and rest on the sill when the window is open.
To secure your window AC unit, close the window on it, and install window locks. This helps hold the air conditioner in place and deters burglars looking for an easy entry.
You may use an air conditioner support bracket for added safety. The open space on the sides of the air conditioner must be sealed with the appropriate side panels (usually included). All air gaps should be sealed with weather stripping. If they aren’t sealed, hot air can enter the room and create efficiency issues.
Because air conditioners cannot run using an extension cord, choose a window with a nearby outlet. The preferable window is a north-facing window, as this will offer shade to provide optimum performance. Lastly, it is essential to keep the air conditioner free from possible obstructions — inside and outside — because efficient operation requires unobstructed airflow around the entire unit.
Noise levels
High noise levels aren't just annoying. They can cause permanent hearing loss by damaging cells and membranes in the cochlea. According to the Centers for Disease Control, prolonged listening to any sound above 70 decibels — the volume of the average vacuum cleaner — is all it takes to cause damage.
Fortunately, most window air conditioners operate at less than 60 decibels. While this makes them safe for your ears, some people may still find that volume level aggravating, especially when the unit is cycling on and off. If you are searching for a window air conditioner for your bedroom, a higher noise level may be a deal-breaker because it could disrupt your sleep.
\Some air conditioners run at volumes only slightly louder than a library. Assessing the unit's decibel rating will help you to determine how loud it will be when running. You can also look for models with vibration-dampening features, multiple fan speeds or a quiet mode.
Additionally, you can insulate the air conditioner by placing 2 inches of insulation foam around the unit and cleaning it regularly so no dirt or debris can increase the operating volume.
Our top picks: Noise levels
- Frigidaire 15,100-Btu Window-Mounted Air Conditioner: This model operates at 52 decibels, which is roughly the volume level of a normal conversation.
- Frigidaire 5,000-Btu Window-Mounted Air Conditioner: As expected, this model also operates at 52 decibels, making it another suitable option if you want a moderately quiet air conditioner.
- Midea 8,000-Btu U-Shaped Smart Inverter Air Conditioner: At 42 decibels, this is the quietest option on our list. If operating volume is a priority, look here.
- Midea 5,000-Btu EasyCool Air Conditioner: This Midea has a 57-decibel operating level, making it the loudest option on our shortlist.
- LG 6,000-Btu Window Air Conditioner: The noise level of the LG is comparable to Frigidaire. This model operates at 52 decibels, making it another decent choice for a quiet window air conditioner.
Features and functionality
A window air conditioner keeps you cool. But depending on the one you buy, it may increase your at-home comfort in other ways. For instance, an air conditioner functions similarly to a dehumidifier. As such, many models can help if you have high moisture content in your air. And the filter may help remove some particulates from the air. However, both features are side benefits. If you have a problem with humidity or unclean air, a dedicated dehumidifier is the best option.
Here are a few features you may want to consider when shopping for a window air conditioner.
- Heater: This allows you to use your air conditioner all year because it can lower or raise the temperature of a room, depending on your needs.
- Thermostat: A thermostat is a temperature-controlled switch that shuts off an air conditioner when the desired temperature has been reached. It can also turn the unit on when the temperature gets too high. This feature helps save energy.
- Multiple fan speeds: With multiple fan speeds, you have greater flexibility over the unit's cooling power.
- Adjustable air deflector: If you want to direct cool air to a specific spot, you need an adjustable airflow deflector. This feature functions like the adjustable air vents in your car, letting you direct the airflow.
- Sleep mode: Your body naturally cools down when you sleep. An air conditioner with a sleep mode gradually increases the room temperature while you sleep, keeping you comfortable and saving energy.
- Programmable timer: With a programmable timer, you can select when the air conditioner turns on and off, even if you’re asleep or not home. This saves energy because the unit can remain off until just before you arrive home.
- Remote operation: If you want to control your window air conditioner without getting out of bed or off the couch, you need a remote or one that can be adjusted via an app.
- Smart operation: Smart operation lets you control your air conditioner from anywhere. It also lets you tap into your smart-home hub so you can control the unit with your voice.
Our top picks: Features and functionality
- Frigidaire 15,100-Btu Window-Mounted Air Conditioner: Our favorite Frigidaire is packed with features. It offers multiple fan speeds and has a sleep mode and a 24-hour programmable timer.
- Frigidaire 5,000-Btu Window-Mounted Air Conditioner: This model effortlessly maintains the preset room temperature. We like the extra-long cord that gives you greater flexibility when choosing an installation location.
- Midea 8,000-Btu U-Shaped Smart Inverter Air Conditioner: Besides being the quietest-running model on our shortlist, this smart appliance can be controlled via an app from anywhere you can access Wi-Fi. Alexa and Google Assistant also let you use voice commands to control the air conditioner.
- Midea 5,000-Btu EasyCool Air Conditioner: This model doesn't have any notable bells or whistles, but it is affordable and easy to operate.
- LG 6,000-Btu Window Air Conditioner: If you want full control over the direction of the air, this model gives you that with its two-way air-deflector system. It also has three fan speeds to help you customize your cooling.
Maintenance and care
Considering how much a window air conditioner runs, surprisingly little maintenance is required to keep it in peak condition. The most important task is keeping the air filter clean. This essential component traps particulates and keeps the unit running efficiently. If the air filter gets too dirty, it increases the strain on the air conditioner and may shorten its lifespan.
Luckily, most models have reusable air filters you simply remove and clean according to the manufacturer's directions. The best air conditioners may alert you when this needs to be done. If not, we suggest cleaning it once each month. If your air contains an excessive amount of pollen or other airborne particulates, you will want to check the filter more often.
Alternatively, some models may have a disposable filter. For these air conditioners, you would need to purchase a new filter and dispose of the old one as directed in the owner's manual.
Besides keeping the air filter clean, make sure the unit is clean and the fins in the back are straight and clean. When wiping it down, use a damp cloth, and avoid the control panel to prevent sensitive electronic parts from getting wet.
Our expertise
Allen Foster joined BestReviews in 2018 as a product writer. Before that, he worked at one of the country's largest home improvement retailers. His training involved attending seminars and workshops on home products ranging from tools to appliances to learn how to accommodate customers’ needs. Allen is a knowledgeable DIYer who worked in construction after college to learn how professionals get the job done.
