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8 Best Room Air Conditioners

We examine the best single-room air conditioners for surviving sweltering temperatures. This collection promises less sweaty days and more sleep-filled nights.

Our editors and experts handpick every product we feature. We may earn a commission from your purchases.

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How To Choose a Room Air Conditioner

Today’s cooling technology has come a long way, making it easy to beat the heat without the expense of central air conditioning.

When choosing a room air conditioner, you first should determine the square footage of the space you’re cooling; calculate by multiplying the length by width. Next, decide between a floor-standing, wall- or window-mounted model. Also consider options like timers, night settings, lighted display, oscillation, remote controls, etc.

Here are the most essential figures to consider when buying a single-room air conditioner:

  • Btu (British thermal unit): Figure around 20 to 30 Btu per square foot of living space. Add 10 percent for kitchens and sunny rooms.
  • Noise score: For low-noise levels, stay below 55 on the decibel (dB) scale.
  • Energy savings: Look for the Energy Star label and an energy-efficiency ratio (EER) of 10 or above.
  • Cost: Generally, the higher the Btu, the more you’ll pay.
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5000 BTU Window Air Conditionervia

Best Small Room Air Conditioner

Compact in size and cooling capacity, this window air conditioner by Homelabs is one of the company’s most popular units. It delivers 5,000 Btu, enough to keep home offices and small bedrooms up to 250 square feet comfortable, night and day.

Super easy to install, it fits windows 23 to 36 inches wide and 13 inches high. And it comes with a reusable filter, support brackets, leaf guards, window seal foam and a handy drip-free installation guide.

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Whynter portable air conditionervia

Best Large Capacity Room Air Conditioner

With the biggest cooling capacity on our list at an impressive 14,000 Btu, the Whynter portable air conditioner can bring down the temperature in a 500 square foot space. A dual hose drains the exhaust condensation automatically, and it pulls up to 91 pints of moisture from the air each day. It’s powerful enough to cool the biggest room in your home.

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stand alone air conditioner via

Best Standalone Room Air Conditioner

Ideal for places where window air conditioners are not allowed, the SereneLife freestanding portable air conditioner is a godsend during unexpected heat waves. This go-anywhere air conditioner on wheels can be transported easily from room to room — to the nursery for baby’s nap time, your office for a Zoom meeting or the living room for entertaining friends.

This unit comes with a universal window mount exhaust kit for venting outdoors. Available in 8,000, 10,000 and 12,000 Btu sizes, with or without a heat mode.

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quiet air conditionervia

Quietest Room Air Conditioner

Silence is golden, especially for the light sleepers among us. Iconic brand Frigidaire makes this portable room air conditioner one of the quietest operations in its class.

Boasting a decibel rating of 49 to 52 — similar to the sound of a fan or refrigerator motor — the unit features customizable extras such as a multi-speed fan, a programmable 24-hour timer, sleep mode and an easy-to-clean filter. One five-star reviewer on writes, “It’s nice to not have to turn up the TV to hear over the AC.”

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traveling air conditionervia

Best Traveling Room Air Conditioner

Using a micro compressor to cool the air, the Zero Breeze Mark 2 is not just a fan calling itself an air conditioner, but the real thing. With 2,300 Btu, it has about one-fourth the cooling capacity of a car air conditioner, consumes less electricity than a conventional AC unit or swamp cooler and runs on a 24-volt direct-current power adapter or battery.

Like most air conditioners, a certain amount of condensation happens, which can easily be directed to a container through the drainage pipe (included). Weighing less than 17 pounds and sized smaller than a bread box, the Mark 2 is especially popular with those living a nomadic lifestyle.

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smart air conditionervia

Best Smart Room Air Conditioner

Simplify your life when you sync to your home’s indoor environment with the LG Energy Star 12,000 Btu window-mounted air conditioner.

Set the temperature, change modes and start and stop cooling from anywhere with a swipe of your smartphone. Connect to the LG ThinQ app that works with Google Assistant and Amazon Alexa. A top performer, the LG shows it has the brains to manage your comfort and your energy bills.

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Mr. Cool air conditionervia

Best DIY Installed Room Air Conditioner

Want to save bundles on costly professional installation? The MrCool do-it-yourself ductless mini-split air conditioner and heat pump comes pre-charged and ready to mount and hook up, all without special tools or training.

The unit features a split system for ambient cooling and heating, smartphone app controls and built-in leakage protection that sends an alerts if it detects low refrigerant levels.

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Evapolar air conditionervia

Best Personal Room Air Conditioner

One of the tiniest air conditioners you’ll ever come across, the evaChill four-speed portable evaporative cooler air conditioner chills 45 square feet of space. Placed on your desk or nightstand, this personal evaporative air-cooling device creates a refreshing breeze, much like nature does.

An eco-friendly solution, the evaChill doesn’t contain toxic Freon or other coolants. Here’s how it works: Pour water into the tank and plug it into any regular electrical wall outlet. It consumes no more power than a standard fan.

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Toni DeBella
Toni DeBella is a culture and lifestyle writer, reviews expert and DIYer covering everything from pests to pool cabanas to painting. For over a decade, Toni was the owner of a successful faux finishing, mural and children’s furniture business before moving to a career in writing. Her work has appeared in The Telegraph, Fodor’s, Italy Magazine, DK Eyewitness travel guides and others. She lives in a medieval hill town in Italy where her bicycle “Raoul” serves as her primary mode of transportation.