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How to Choose the Correct Size AC Unit for Your Home

If you’re living in Texas, you know that an efficient and properly sized air conditioning unit isn’t just a luxury—it’s a necessity. Whether you’re in the heart of San Antonio or relaxing by the lake in Austin-Lakeway, choosing the right size AC unit makes all the difference in comfort and energy efficiency.

At Air & Plumbing Today, we help homeowners make smart choices that keep their homes cool and energy bills low. Here’s what you need to know when picking the right size air conditioning system.

Why AC Size Matters

When it comes to AC units, bigger isn’t always better. A unit that’s too large may cool the space quickly but won’t effectively remove humidity, leading to that cold-and-damp feeling. A unit that’s too small will constantly run, wasting energy and still leaving you uncomfortable.

Choosing the correct size ensures:

• Better energy efficiency
• Longer unit lifespan
• Consistent indoor temperatures
• Lower utility bills

What Factors Affect AC Size?

Several key factors go into choosing the right size system:

• Square Footage: Measure the length × width of each room to find total square footage.
• Insulation Quality: Well-insulated homes retain cool air better and require less tonnage.
• Ceiling Height: Higher ceilings mean more air to cool, possibly increasing the size needed.
• Windows & Sun Exposure: Rooms with large or west-facing windows often need more cooling.
• Local Climate: Hot Texas summers demand more cooling power than milder areas.

General Sizing Guide (Converted to Tons)

Below is a simplified estimate to help you get an idea of what size unit you might need. These estimates are based on the standard conversion of 12,000 BTUs = 1 ton of cooling power.

Pro Tip: These are general guidelines. The exact tonnage should be determined through a professional load calculation, taking into account all influencing factors. Your friendly local Air & Plumbing Today HVAC experts can come by your home and help you calculate the best ac system for your home 7 days a week at no charge!

Don’t Forget About AC Filter Size

Another key aspect of your system’s performance is using the correct AC filter size. The right filter improves indoor air quality and helps your unit run smoothly. Filters with a higher MERV rating trap more dust and allergens but must be compatible with your unit to prevent airflow issues.

What About Allergies

Modern day ac units have add-ons that provide integrated systems for advanced air purification.  These enhanced filtration systems can make a huge difference for people with chronic allergies and asthma.  Combined with a UV light that kills bacteria and viruses on your AC system’s coils, you’re all set for the cleanest air you’ve ever breathed in!

Get a Professional Estimate from the Experts

Not sure which size is right for your home? That’s where we come in.

At Air & Plumbing Today, we’re proud to be a Comfortmaker® Elite Dealer, offering industry-leading HVAC systems that are both reliable and efficient. Our team of super-friendly, licensed technicians will evaluate your home and provide expert recommendations to ensure year-round comfort.

Call us today for your free estimate on a new AC system:

• San Antonio: 210-519-5959
• Austin / Lakeway: 512-859-5959

Air & Plumbing Today: Trusted, Local & Cooling Texas One Home at a Time 

When it’s time to upgrade or replace your air conditioning system, trust the team that puts your comfort first. With expert service, honest recommendations, and quality products—we’re the team that makes your AC problems, “no problema.”