RepairClinic DIY Blog RSS Feed


Heating and Cooling How to determine what size window air conditioner you need

Published on June 6th, 2013 | by Terry Spencer

4

How to determine what size window air conditioner you need






A properly-sized air conditioner unit will maximize energy efficiency, remove humidity in the air and ensure your space is cool and comfortable throughout the season. Tweet this tip.

An undersized air conditioner will have to work harder, waste energy and cost you more money. Tweet this tip.

Conversely, an oversized unit will cycle too quickly and may not run long enough to remove humidity in the air. The result? Sticky or clammy-feeling air. Tweet this tip.

A little homework will go a long way in ensuring you find the right size air conditioner to maximum efficiency in your space and save money.

How to determine what size window air conditioner you need

Here’s the easy way to determine what size air conditioner is best for your space and needs:

  1. Measure your window size.
  2. Check the power available near the window. Some larger air conditioners require a dedicated 220 volt circuit.
  3. Cooling capacity is measured in British thermal units (Btus) per hour. You’ll need to calculate the number of Btus required for your space. Use the handy chart below and consider the following factors:
  • If you have high ceilings or multiple windows in your space, you’ll need to increase required Btus slightly.
  • If your space is highly shaded, you can reduce the required Btus by 10 percent.
  • If there is abundant sunshine in your space, increase the required Btus by 10 percent.
  • If the space includes a kitchen, add 4,000 Btus. Due to cooking, kitchens generate more heat than other rooms.
  • Add 600 Btus per person who regularly spends time in the room or space.

Here are the recommend sizes listed by square footage of the area to be cooled. All figures are based on a room with its ceiling at eight feet. Tweet this.

Square footage of area to be cooled/capacity needed (Btus /HR)

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 1,000 = 18,000

1,200 to 1,400 = 23,000

1,400 to 1,500 = 24,000

Source: www.EnergyStar.gov

After you have your air conditioner installed, check out these tips about getting your unit ready for the cooling season.

Learn something from this post? Please share it! Click on the social media icons on the left.

Something not working right?

RepairClinic.com has replacement parts and accessories for air conditioners including air filters, covers, remote controls, knobs, touch-up paint, side curtains with frames and many other products. Tweet this tip.

With your model number handy, head to RepairClinic.com to find parts recommended for your model.

Related info

Six simple ways to get your window or through-the-wall air conditioner ready for summer

AC maintenance tips

Five ways to save money and energy during heat waves

How an air conditioner works

How to find your air conditioner’s model number

Love DIY tips and discounts? We do, too. That’s why we give them away.

Have you joined our free VIP email list?

Follow us:

YouTube
Google Plus
Facebook
Pinterest
Twitter


Need help finding the right part?

We’re here for you 7 a.m. to midnight ET, every day.
Call us at 1-800-269-2609 or chat with us live on RepairClinic.com.

About RepairClinic

Since 1999, three and a half million people have purchased replacements parts and accessories from RepairClinic and saved more than $260 million in repair costs by fixing appliances, lawn equipment, power tools, and heating & cooling equipment on their own. From the beginning, RepairClinic has provided free troubleshooting and how-to resources on its website.

The company’s 2,000+ free how-to repair and how-it-works videos on its YouTube channel have been viewed more than 41 million times.

RepairClinic’s free, advanced online repair help system empowers do-it-yourselfers to fix common problems associated with home appliances, lawn equipment, power tools and heating & cooling equipment. DIYers can enter a model number to choose from a list of common symptoms for that particular model, troubleshoot and watch award-winning, expertly-produced videos to learn the most likely causes and conditions and purchase the correct part.

RepairClinic.com stocks more than one million parts and accessories for 160 brands of lawn mowers, small engines, snowblowers, string trimmers, furnaces, air conditioners, air handlers, heat pumps, washing machines, dryers, dishwashers, vacuum cleaners, power tools and many other products.

Since 1999, the company has served more than three million customers including homeowners, first-time and beginner DIYers, advanced DIYers, appliance repair professionals, small engine repair shops and landscaping and lawn care business owners. RepairClinic orders are backed by a 365 Days. Period.® return policy that enables customers to return any part. Of the more than one million parts available on the website, 95 percent of parts ordered are in stock and guaranteed to ship the same business day. RepairClinic ships within the United States, U.S. territories and military bases and Canada.




Tags: , , , , , , , ,


About the Author

Terry Spencer is an in-house appliance and HVAC expert for RepairClinic.com. He has 29 years of expertise in appliances and HVAC equipment repair. Prior to joining RepairClinic in 2011, Terry was a respected, well-known technician at one of metro Detroit’s top residential appliance and HVAC repair businesses. Enthusiastic about fixing things and helping people, Terry enjoys his position with RepairClinic. He has a leading role in the development of RepairClinic’s how-to repair videos and repair help content. He’s also frequently called on for technical advice and press information for journalists and bloggers. He regularly completes extensive manufacturer training for appliances, HVAC equipment and outdoor power equipment. Terry has a refrigeration license and holds multiple certifications for an array of products. As a child, Terry was known to take appliances apart simply to see how they worked. While growing up on a farm, he taught himself how to repair small engines. Terry enjoys creating content that reaches and helps so many people solve problems on their own. In collaboration with colleagues, he develops and leads frequent Customer Care staff training programs for appliances, HVAC equipment and outdoor power equipment. When he’s not at RepairClinic, Terry spends time with his wife and children. An avid outdoorsman, Terry also enjoys Michigan’s seasons. He and his family reside in the Ann Arbor, Michigan area.



4 Responses to How to determine what size window air conditioner you need

  1. Michelle L says:

    Thanks so much for the valuable info! Looks like temps are going to be scorching around here again this summer & we’re in need of a new window A/C.

  2. Dave says:

    Is there an easy way to prepare a vinyl replacement window to install a window air conditioner? Since the bottom of the window is no longer flush with the sill I usually end up clamping a 2X4 to the sill and filling in btw the inner & outer vinyl with wood also to support the unit plus more outside the window. It would be nice if some one would make some kind of bracket/support device to do this.

    • Hi Dave,

      Thanks for the comment. Yes, there is a great bracket to solve that common dilemma of properly supporting AC units in windows. It installs from the inside so it’s simple to set up. There are two sizes based on the AC unit size. On RepairClinic.com, you’ll find item #12915, which supports up to 85 pounds (usually an air conditioner of 5,000 to 10,000 btus).

      See it here:
      http://www.repairclinic.com/PartDetail/Air-Conditioner-Support-Bracket/AC080/12915.

      For larger units, up to 160 pounds (usually air conditioners from 12,000 to 24,000 btus), item #12916 comes with its own bubble level for more accurate installation. If you have any questions about these brackets, please contact us at 1-800-269-2609. Thank you! Have a nice summer.

Leave a Reply

Your email address will not be published. Required fields are marked *

* Copy This Password *

* Type Or Paste Password Here *

34,513 Spam Comments Blocked so far by Spam Free Wordpress

Back to Top ↑

  • Recent Posts

  • RepairClinic.com’s Facebook Page

  • Google+ Add to circles

  • Join the VIP email list

    Don’t miss out

    Sign up for our free VIP email list for:

    • Exclusive discounts and promotions
    • Money-saving tips

    You’ll receive messages a few times monthly. You can unsubscribe instantly at any time.

  • Categories

  • About RepairClinic.com

  • Snag our buttons…

    …and spread the DIY know-how


  • appliance dishwasher diy do it yourself dryer energy kitchen landscaping lawn care lawn mower maintenance maintenance tips outdoor power equipment outreach press release press releases refrigerator repairclinic safety small engine snowblower tips washing machine