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What Size Air Conditioner Do I Need?

When shopping for an AC replacement, it can be overwhelming to consider all the factors that can affect your new ACs efficiency. Once you’ve chosen the SEER rating you want and maybe even the brand you prefer, it’s time to figure out the best size AC for your home. So, how do you know what the best size is? Mission AC has all the information you need to make this decision.

Why Is AC Size So Important?

It’s important to select an appropriate size AC system because it will determine how efficient it is in your home. 

A unit that is too small for the space will run constantly just to try to keep up with the cooling needs of the home. This causes strain on the system and on your wallet! A unit that runs all the time is going to use an enormous amount of energy causing your bill to rise.

However, too much of a good thing can also be a bad thing. Installing an AC system that is too large for the space in your home causes other problems. The unit will lower the home to the desired temperature too quickly and shut off often. The consistent on and off will use up more energy as well. 

Also, air conditioners are responsible for filtering the moisture out of the air. To do this, they need time. If an AC unit cools the home too quickly and shuts off, the home will not be properly dehumidified. This will leave your home cooled, yes, but it will feel very clammy as well. 

How Do I Get The Right Size AC For My Home?

There are a couple of ways to calculate the best size AC unit for your home. 

Contact Air Condition Experts

Contacting an AC professional is always a good option because they have a lot of knowledge and experience helping with a home’s energy-efficient AC installation. AC professionals have an entire list of factors they consider when advising you on the best size system for your needs:

  • Total volume of a home’s living space – not just square footage
  • The amount of exterior walls exposed to sun
  • Window information – number, age, condition, orientation 
  • How old your home is
  • The quality of insulation and air sealing
  • The ductwork and  ventilation system in place
  • Any shade provided by trees and shrubs

To have an AC expert calculate the required AC size based on this extensive formula, simply contact an AC company like Mission AC. We’re happy to help you choose the perfect unit. 

DIY Calculation

If you want to calculate your AC size yourself or are just curious about the rough estimate you might require, you can use a simple formula. 

First, it’s important to know that AC sizes are measured in tons and BTUs (British thermal units). One ton of cooling is equivalent to 12,000 BTUs per hour. So, finding the right size unit for you means knowing the amount of BTUs your home needs to be cooled. 

To calculate BTUs, you can use the square footage in your home. If you don’t know the square footage of your home or only need the measurements for one room, simply multiply the length and the width of the room. Once you have the square feet, multiply that number by 25 BTUs. 

For example, a room measuring 12 by 10 feet has a square foot measurement of 120 square feet. 120 square feet multiplied by 25 BTUs equals 3,000 BTUs as a rough minimum to cool that room. Similarly, if the total square footage of your home is 1,500 square feet, your BTU requirements would be in the 30,000 BTU range.

Remember, this calculation does not take into account all of the other factors that can affect the AC efficiency. It can give you a rough estimate, but it is still best to consult with an AC technician before making the final decision.

Need Help With Your AC Size?

If you need assistance to determine the best size AC unit for your home, or even just a double check on your rough estimate, contact Mission AC today! We are the best air conditioning company in Houston for you. Our experience and dedication to the community surpasses all others. We’d love to hear from you!

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What Our Customers Say

Dedication and Hard Work

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