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What Size Air Conditioner Do I Need?

If you’re considering installing a new or replacing your current air conditioning unit, remember that bigger isn’t always better. If you install a unit that is too big for your home, you’ll end up spending more money on the initial cost, as well as wasting additional money and energy every month.

But, on the flip side, if you install an air conditioning system that is too small, it will struggle to keep your house cool and will run up your energy bill by needing to run constantly.

When you have questions about your home’s Heating and Cooling in Ventura County, come to the pros at Aladdin Air Conditioning & Heating.

Consult the Manual

The Air Conditioning Contractors of America (ACCA) devised a method for calculating the cooling load of your home. Manual J is nationally recognized for producing HVAC equipment sizing loads for single-family homes, townhomes, and condos.

Many elements go into determining the desirable unit size, such as square footage, the number of windows in your home, amount of natural shade and sunlight, location of ducts, how high your ceilings are, and several others.

Here’s a link to learn more about Manual J and how to calculate the residential load needed to cool your home. However, this is a very complicated system, so we’d recommend speaking with the professionals at Aladdin before starting this process on your own.

For the DIY Crowd

If you’re determined to calculate an accurate estimate of your home’s cooling needs, here’s a helpful tip to figure out the size of air conditioning unit you’ll need for your home: start by determining the total square footage.

To find the square footage of a single room, simply measure the length and width and multiply the two numbers together. Do this for each additional room the unit will be cooling and total all of the numbers. That will give you the total square footage.

Here’s a base guide on how many BTUs your unit needs to run per hour in order to cool your home:

Square Feet BTUs Per Hour
1,000-1,200 21,000
1,200-1,400 23,000
1,400-1,500 24,000
1,500-2,000 30,000
2,000-2,500 34,000


It is important to understand that these are base numbers and will need to be adjusted for additional features in your home. Some of these features may include:

  • Higher Ceilings
  • Living in Hotter Climates
  • Number of Occupants
  • Large Amount of Sun Exposure

Call the Experts at Aladdin Today

Whether you’re searching for air conditioning installation in Thousand Oaks or a new HVAC contractor in Van Nuys, the highly skilled technicians at Aladdin Air Conditioning & Heating are here to take care of all your heating and air conditioning needs.

If you’re considering a new AC unit, need AC repair services, duct cleaning, or indoor air quality recommendations, give us a call today!

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Office Location

1090 Lawrence Dr. #105
Newbury Park, CA 91320

License #739136


Ventura County


San Fernando Valley