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How to Choose the Right AC Size for Your Home

Air conditioning is a lifesaver, especially during those sweltering summer months. But how do you ensure that you choose the right AC size for your home? An air conditioner that’s too small will strain to cool your home, and one that’s too large can lead to inefficiencies and higher energy bills. Here are five crucial considerations to guide your decision.

  1. Understand the Basics of BTU

What is BTU?

  • BTU stands for British Thermal Unit. It’s a measure of how much heat an air conditioner can remove from a room in one hour.
  • Higher BTU ratings mean the unit can cool larger areas or rooms with more heat.

Why is it Important?

  • Ensuring you have the right BTU for your space ensures efficient cooling without wasting energy.
  1. Calculate Your Room Size

Square Footage is Key

  • Begin by measuring the length and width of your room, then multiply these figures to get your room’s square footage.

Estimating BTU Needs

  • For rooms up to 150 sq ft: 5,000 BTUs
  • 150-250 sq ft: 6,000 BTUs
  • 250-300 sq ft: 7,000 BTUs
  • And so on…
  1. Factor in Ceiling Height and Insulation

Why it Matters

  • Homes with high ceilings or poor insulation will need air conditioners with higher BTUs due to the increased volume of air and potential for heat loss.


  • If you have ceilings higher than the standard 8 feet, consider adding 10% more BTUs for each additional foot.
  • Check the quality of your home’s insulation. If it’s subpar, consider upgrading or adjusting your BTU requirement.
  1. Consider the Sun’s Impact

Direction Matters

  • Rooms that face the sun or have multiple windows can heat up faster.


  • If your room gets a lot of sun, increase the BTU by 10%.
  • For shaded rooms, reduce the BTU by 10%.
  1. Don’t Forget About Occupants and Appliances

More People, More Heat

  • Each person can add heat equivalent to a 100-watt light bulb!

Appliance Heat

  • Appliances, especially those like ovens or stovetops, can significantly increase room temperature.


  • For each additional person (over 2 people) who frequently occupies the room, add 600 BTUs.
  • Be aware of the heat-generating appliances in your space and adjust BTUs accordingly.

The Importance of Regular Maintenance

Even after selecting the perfect AC unit, regular maintenance can’t be ignored.

Maintenance Ensures Longevity

  • Just as a car needs periodic servicing to run smoothly, your AC requires regular checks to perform at its best.

Preventing Unexpected Breakdowns

  • Regular maintenance can catch potential issues before they become major problems. This not only saves you the discomfort of a malfunctioning AC in the midst of a hot summer day but also potential high repair costs.

Energy Efficiency and Cost Savings

A correctly sized and well-maintained AC unit isn’t just about comfort—it’s also about cost and environmental impact.

Reduced Energy Bills

  • An appropriately sized AC will run more efficiently than an oversized or undersized unit, translating to savings on your monthly energy bills.

Eco-friendly Choice

  • An efficient AC reduces your carbon footprint by consuming less power, making it an environmentally friendly option.

Upgrade or Repair?

As your AC unit ages, you might face the dilemma of whether to repair or replace.

When to Repair

  • If the unit is less than 10 years old and has had only minor issues, a simple ac repair Richardson service or your local area service might be the best choice.

When to Replace

  • Older units that frequently break down or fail to cool efficiently might be signaling it’s time for an upgrade. Newer models tend to be more energy-efficient, offering both enhanced performance and cost savings in the long run.

Making the Right Choice

Now that you’re armed with this knowledge, you’re poised to make an informed decision about the best AC size for your home. Remember that while these are general guidelines, each home is unique. Consulting with a trusted professional can ensure you get the perfect fit for your space.

If you’re in the Dallas, TX, McKinney, TX, or Richardson, TX areas and need expert advice or AC repair, consider reaching out to a trusted local name: The Right Choice Heating and Air Inc. Known for their impeccable service, they’re a top choice for homeowners who want to ensure their AC systems are in peak condition. Whether you need advice on selecting a new unit or require ac repair in Richardson, don’t hesitate to contact The Right Choice Heating and Air Inc. After all, with a name like that, you can be sure you’re making the right decision.


The Right Choice Heating and Air Inc.
1411 E Campbell Rd #1800, Richardson, TX 75082