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How to Select the Best Window Air Conditioner

by on June 09, 2017
in Health and Home, Home Improvement, Tips & How-Tos :: 18 comments

There is no need to suffer through summer heat when inexpensive, energy-efficient air conditioners are widely available. Since October 26, 2015, all ENERGY STAR rated room air conditioners have been required to meet a new standard, ENERGY STAR 4.0, that sets maximum power use at 10% less than older models following the 2014 guidelines. And, when used to provide cooling only where they're needed, room air conditioners are less expensive to operate than central units. This guide will help you find the model that is right for you.

Energy efficiency of room air conditioners

A room air conditioner's efficiency is measured by the energy efficiency ratio (EER). The EER is the ratio of the cooling capacity (in British thermal units [Btu] per hour) to the power input (in watts). The higher the EER rating, the more efficient the air conditioner. Each increase of 1.0 on the EER scale represents a 10% increase in energy efficiency.

When buying a new room air conditioner, information about the EER can be found on the EnergyGuide label for the unit. Look for an EER of at least 12 and the ENERGY STAR label. Earning the ENERGY STAR means a product meets strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy. 

Properly Sizing a Room Air Conditioner

The required cooling capacity for a room air conditioner depends on the size of the room being cooled. Room air conditioners generally have cooling capacities that range from 5,500 Btu per hour to 14,000 Btu per hour.

Many people buy an air conditioner that is too large, thinking it will provide better cooling. However, an oversized air conditioner is actually less effective — and wastes energy at the same time. Air conditioners remove both heat and humidity from the air. If the unit is too large, it will cool the room quickly, but only remove some of the humidity. This leaves the room with a damp, clammy feeling. A properly sized unit will remove humidity effectively as it cools.To figure out which size unit is best for your cooling needs, see the Air Conditioner Cooling Needs Calculator below.

Other factors to consider when buying

Verify that your home's electrical system can meet the unit's power requirements. Room units operate on 115-volt or 230-volt circuits. The standard household receptacle is a connection for a 115-volt branch circuit. Large room units rated at 115 volts may require a dedicated circuit and room units rated at 230 volts may require a special circuit. If you are mounting your air conditioner near the corner of a room, look for a unit that can direct its airflow in the desired direction for your room layout. If you need to mount the air conditioner at the narrow end of a long room, look for models that have a “turbo” fan mode that can drive air further into the room. Other features to look for:

  • A filter that slides out easily for regular cleaning
  • Logically arranged controls
  • A digital readout for the thermostat setting, and
  • A built-in timer.

Do you need a smart air conditioner?

For those that keep to a regular schedule and don't have smart home devices installed in their home, a timer will help save money (about $100 on the air conditioner itself and your energy bill) and save you from coming home to a hot, stuffy home. For many, though, the ability to control a room air conditioner from anywhere can be a huge help and cost savings, especially if you don't stick to a schedule. And, you can connect them to other smart home devices so they fit seamlessly into your daily routine.

Our Picks

Small rooms (up to 150 square feet)

The Frigidaire FFRE0533S1 ($167.99 on Amazon), rated at 5,000BTU, gets high marks for its cooling and dehumidification capabilities of up to 1.1 pints per hour. The unit, which has an EER of 12.2, two cooling and two fan speeds, a 24-hour programmable timer, built-in thermostat with digital temperature readout, remote control and a four-way adjustable vent to direct air flow.

Medium rooms (up to 350 square feet)

Frigidaire FGRC0844S1 Cool Connect

The Wi-Fi connected Frigidaire Cool Connect ($297 on Amazon) delivers 8,000 BTUs, enough to cool a room up to 350 square feet, with an EER of 12.0. The unit has 3 fan speeds and 2-way slanted louvers that direct airflow in an upward, circular motion for even cooling. You can create a custom 24-hour schedule or control the unit remotely with the Frigidaire app for iOS and Android or dedicated remote control. And, it works Google Assistant and Amazon Alexa enabled products. If the power goes out, the unit will automatically restart when power is restored.  It has an air ionizer to help remove allergens, like pollen, and other impurities from the air and the magnetic front grill, which has an antibacterial filter, easily detaches for cleaning. 

Installing and operating your room air conditioner

A little planning before installing your air conditioner will save you money and energy. The unit should be level when installed so that the inside drainage system and other mechanisms operate efficiently. If possible, install the unit in a shaded spot on your home's north or east side. Direct sunshine on the unit's outdoor heat exchanger decreases efficiency by as much as 10%. You can plant trees and shrubs to shade the air conditioner, but do not block the airflow.

Don't place lamps or televisions near your air-conditioner's thermostat. The thermostat senses heat from these appliances, which can cause the air conditioner to run longer than necessary.

Set your air conditioner's thermostat as high as is comfortably possible in the summer. The less difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be. Don't set your thermostat at a colder setting than normal when you turn on your air conditioner; it will not cool your home any faster and could result in excessive cooling and unnecessary expense.

Set the fan speed on high, except on very humid days. When humidity is high, set the fan speed on low for more comfort. The low speed on humid days will cool your home better and will remove more moisture from the air because of slower air movement through the cooling equipment.

Also, consider using an interior fan in conjunction with your window air conditioner to spread the cooled air more effectively through your home without greatly increasing electricity use. We like the Haiku Home L Series 52-inch Indoor/Outdoor Wi-Fi Enabled fan ($475 on Amazon), which provides coverage for indoor or outdoor space of up to 15 by 15 feet. It has a built-in LED light (40-watt equivalent) with 16 brightness settings. And, because it's WiFi enabled, you can use your smartphone or Amazon's Alexa for control

And, if you can't install a room air conditioner in your window, consider a portable unit. You can check our picks for portable air conditioners.

Updated with new picks 6/9/2017

[Image credit: Window air conditioner via BigStockPhoto, Frigidaire]

Air Conditioner Cooling Needs Calculator

To determine the correct size Air Conditioner for your room, follow these easy steps:

  1. Determine the square footage of the area to be cooled.
  2. Using the square footage and the chart below, determine the correct cooling capacity. Cooling capacity is measured in British thermal units (BTUs) per hour.
  3. Make any adjustments for the following circumstances:
  • If the room is heavily shaded, reduce capacity by 10 percent.
  • If the room is very sunny, increase capacity by 10 percent.
  • If more than two people regularly occupy the room, add 600 BTUs for each additional person.
  • If the unit is used in a kitchen, increase capacity by 4,000 BTUs.
  • For the purpose of this chart, rooms that are connected by permanently open entryways wider than five feet ought to be considered as one room and their square footage should be combined.
Area to be Cooled
(Square Feet)
Capacity Needed
(BTUs per Hour)
100 to 150 5,000
150 to 250 6,000
250 to 300 7,000
300 to 350 8,000
350 to 400 9,000
400 to 450 10,000
450 to 550 12,000
550 to 700 14,000
700 to 1000 18,000
1000 to 1200 21,000


Updated on 6.27/2016 with 2015 Energy Star 4.0 information and new product picks

[brownstone home via Shutterstock, Frigidaire]

Discussion loading


Cooling a dog house

From Kevin G. on June 10, 2014 :: 1:43 pm

We have a 6’d x 8’w x 7’h (interior dimensions) dog house for our great dane and other large dog. The dogs are kept outside during the day and we allow them in our house when we are home from work.

We insulated the dog house for the winter and added a space heater. This works well as they are both short haired dogs.

Our question is what is recommended to keep them cool in the summer. It’s already in the nineties here. We were considering an A/C unit but that may be overkill given the size of the room.



There are AC units for outdorr sheds/doghouses

From Josh Kirschner on June 11, 2014 :: 7:21 am

There are AC units made specifically for outdoor applications like a shed or doghouse. We covered one of the models in our story on Summertime Tech for Your Pet. You can learn more here:



Amazing product reviews.

From Audrey Miller on October 01, 2014 :: 10:07 am

I can’t agree more with your opinions and reviews. All these are definitely remarkable and needs to be noted. This can surely help those who’re having problems with choosing the right air conditioner for their home. This is a must share.



AC That "Samples" The Air?

From Richard Longley on March 02, 2015 :: 12:02 pm

The trouble with all room air conditioners that I have owned is that when you run them in the Energy Saver mode they never seem to turn back on until the room becomes over heated.  I have a room heater that once it warms the room and shuts off it “samples” the room air temperature every 15 minutes by running it’s fan for a few seconds.  That feature works great. Is there a room air conditioner that has this air temperature sampling feature?  If there isn’t there should be.



Energy saver mode

From Ernie on June 19, 2017 :: 6:44 pm

Get an LG room air conditioner. There energy saver setting works!!



night time use

From curiousburke on July 19, 2015 :: 11:06 pm

I like the easy way to calculate AC size with just a few modifiers, but it seems like there is one missing.  How would you modify the calculation in the case that you only plan to us the AC at night in a bedroom.



Great Tips

From Mark Hamill on September 05, 2015 :: 4:26 am

Thanks for sharing useful information



nice share

From toko on October 14, 2015 :: 4:27 am

thanks for the article..tremendous review.great worked! now i deeply understand about air conditioner.i try to figure out lately until i find your blog.god bless u..i will bookmark your site



Great Reviews

From Citicool on June 30, 2016 :: 10:49 pm

Thanks for the reviews! Great tips for those looking to get a window air conditioner for their home as well.



Valuable infomation

From simon willis on May 09, 2017 :: 4:13 am

It is easy way to calculate AC size. Thanks for sharing useful information



Choosing the perfect AC unit

From Jennifer Louis on June 21, 2017 :: 8:20 am

Choosing the perfect AC unit size depends on many factors. Too small AC unit won’t adequately heat or cool your home, and the one that’s too large will be inefficient and expensive to run.



Great Article

From Barbera Peters on July 12, 2017 :: 9:49 am

I wanted to thank you for your information on choosing an air conditioner. I agree that the size of the room determines the size of the machine. You make a really great point on looking at the controls arrangement and checking for built in timers.Since the summer is finally hear and my apartment has zero air conditioning this is my first time buying an air conditioner. I wasn’t sure what to look for but this really helped. Thanks for the great advice.


Great article

From facebook10213762432961406 on July 23, 2017 :: 9:55 pm

thanks a lot for this great article on choosing air conditioner .
Everyone who’s planning to buy a portable air conditioner should take a look at this best selling list



Great post...!

From Ramayan Supply on August 12, 2017 :: 6:07 am

Hey Suzanne Kantra, Great post. I read your article and the tips which you mentioned here…I shared the same tips with my friend, who was looking for Air conditioner 1 week ago. He is impressed and found the right air conditioner for his home. Thanks for sharing information.!



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Multi room window units

From Ron Escamillo on August 30, 2017 :: 7:18 pm

I have a 500 square-foot bachelor apartment attached to a large three car garage that I converted into a one bedroom apartment. It’s now 650 sq ft. with a kitchen, a living room and a bedroom.  I think it’s too small to install central air. Is there a window unit large enough to cool off three rooms?



There are air conditioners that

From Suzanne Kantra on August 31, 2017 :: 8:45 am

There are air conditioners that can cool off spaces that large (look for a 1400 BTU model), but the issue will be getting the air circulate through the 3 rooms. You might be able to do it with fans, but you’re probably better off purchasing units for each room.



Having decided on the type

From Carpet Cost on February 06, 2018 :: 10:38 am

Having decided on the type of air conditioner that you are going to install, you can go to the detailed selection. Pay attention to the following parameters:
- Manufacturer company. Of course, it’s better to choose a company with a name, but it’s not worth chasing fashion brands. Choose is better not from the top three, but from a dozen.
- Serviceability. Be sure to find out how often it is necessary to clean and change the air conditioner filters, whether it is necessary to drain condensate. If you install air conditioning with the help of industrial climbers, maintenance and repair will most likely require their participation.
- The cost of ownership. Evaluation of this parameter often leads to the selection of a more expensive air conditioner, since ownership is cheaper due to installation, maintenance, repair, power consumption and service life. If you have a psychological barrier in relation to the cost of buying an air conditioner, estimate the cost of ownership.
- Additional functions. A modern air conditioner, as a rule, is multifunctional. Heating the room, ionization and air purification, working in sleep mode, special control functions - all this can make your stay in the room more comfortable for you or pass noticed only regarding the cost of the air conditioner. Many functions in practice may not be useful to you, so it’s worth realizing their need. In addition, you can find a good contractor for AC installation here


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