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What Size AC Do You Need?

If you’re faced with a broken air conditioner in San Antonio, the highest to-do on your list is probably finding an efficient AC replacement. You never want to start a Texas summer with inadequate cooling, and that means making sure your AC unit is the perfect size for your home.

Climate Magic’s air specialists are dedicated to ensuring that your home stays both comfortable and efficient throughout the year. Whether you’re shopping for a new AC unit for the future or in need of an immediate AC installation, read on to learn how to choose the right size AC for your home.

Why Is AC Size So Important?

Many homeowners don’t realize how much AC size can affect their homes – and wallets! Choosing an appropriate size AC determines your energy consumption, comfort and expense from the time of AC installation for the 10+ years your unit lasts. 

An AC unit that is too small for the space it needs to cool will struggle to keep up with the demand of your household. It will run long cycles, using more energy than it should, and your home may not reach that crisp cool temperature that you want.

However, overcompensating can be just as dangerous. An AC unit that is too large will run short cycles, turning on and off frequently. This uses more energy and doesn’t allow for proper dehumidification to occur. Your home may feel cool, but it will be invaded by that San Antonio humidity. 

BTU Calculation

The best way to avoid a mis sized AC unit is to get an accurate heating load calculation of your home. The heating load is simply how much heat your home needs pulled from the air to keep your space cool. The tonnage of an AC unit refers to the same thing and is how you will choose your AC size. A professional AC specialist will be happy to help you determine your heating load, but you can also calculate your AC tonnage through a BTU calculation. 

British Thermal Units (BTUs) are the units of energy used to measure the heat absorption capabilities of your AC unit. 1 ton of AC power is equal to 12,000 BTUs of thermal energy. When you know how many BTUs you need to cool your home, then you can transfer that number to tons and find the best size AC. 

  • A DIY BTU calculation is pretty simple. First, you need to know the square footage of your home! 
  • Next, you plug in that number into the equation below: 

(square feet of home) X (25 BTUs) = Required BTUs

  • For example, if you want to know how many BTUs you need for a 1,500 square foot home:

(1,500) X (25) = 37,500 BTUs

  • Lastly, you divide the total BTUs by 12,000 and get: 3.1 tons

Benefits of A Professional Heating Load Calculation

While you are welcome to use the DIT BTU calculations, it is still a good idea to get a second opinion from a professional. HVAC contractors use a similar equation to determine AC size, but their process is much more thorough. They consider all factors of your home that could affect the heating and cooling process:

  • Shade
  • Window Exposure
  • Insulation
  • Number of Inhabitants
  • Total Volume of Home

San Antonio Air Conditioner Installation

If you’re shopping for a new AC unit or are unsure how to upgrade your old AC unit, our team at Climate Magic is here to help. With years of experience and a commitment to our community, we’re your best choice for quality AC installation services. Contact us today for reliable cooling throughout the year!


Why People Choose Us

Customer Focused
We seek to educate our customers about all aspects of maintenance, repair, and replacement of your home's cooling and heating systems, while offering the best service possible.
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Compassionate Service
We care about our customers and how our services affect their lives. Our efficient team provides quick and effective repairs and installations every time to give our customers their lives back.
Honest & Upfront
When you work with our team you will never experience surprise fees. We talk to our customers openly before work begins to get their approval on the service to be provided and the cost.

What Our Customers Have To Say

High Quality Company!

We are loyal customers. Anytime we have had A/C issues, Climate Magic has been very responsive. Martin took good care of our system even though we were overdue for a new unit. When we were finally ready to upgrade, they were able to schedule us in quickly. Peter and Ernie did a fantastic job on our new install! They are very knowledgeable and thorough. High quality company.

Melissa L.

Friendly and Professional!

I have used Climate Magic for many years now and have always had positive experiences. I get a reminder call when it’s inspection time, and messages letting me know when my technician is on the way with a picture of who is coming. Carl Banta usually services my unit and is always friendly and professional. Thank you Climate Magic!

Lynne C.

Quick Response!

Climate Magic installed my a/c unit years ago! They have been professional, courteous and prompt to fix any problems I have had over the years. The latest was last week when my a/c stopped working in 100+ degree weather! My technician was there in about an hour, and the unit was fixed within an hour. Thank you for keeping me cool!!!

Teri S.