Ask Trammell Heating & Air

How Big of an AC Unit Do I Need?


Trammell Heating & Air Delivers Five-Star Heating and Cooling Services to Buford, Georgia and the Surrounding Northeast Atlanta Metro Areas


Table of Contents

Finding the right size air conditioner (AC) is crucial for maintaining comfort and energy efficiency in your home. If you install an AC unit that’s too small, it will struggle to cool your space, while an oversized unit will cycle on and off too frequently, leading to inefficient energy use and a shortened lifespan. 

If you’re asking, “How big of an AC unit do I need?” we can help. Trammell Heating & Air is one of the top HVAC companies in Athens, GA, and is here to guide you through the process of determining the perfect AC size for your home. 

Why Does It Matter What Size Air Conditioner You Install?

Choosing the right size AC unit is essential for several reasons:


      • Comfort: An appropriately sized AC will effectively cool your space, maintaining the desired temperature and avoiding hot or cold spots.

      • Energy Efficiency: A properly sized AC uses less energy, saving you money on electricity bills.

      • Longevity: Operating within its ideal capacity minimizes stress on the unit, ensuring a longer lifespan and fewer breakdowns.

    An undersized unit will struggle to cool your entire home, leading to constant operation and higher energy costs. Conversely, an oversized unit will cool your home too quickly, causing it to cycle on and off frequently. This short cycling leads to uneven cooling, increased humidity, and higher energy consumption.

    How To Determine the Ideal Air Conditioner Size

    Have you been asking, “How big of an AC unit do I need?” Determining the correct size AC for your home involves several steps and considerations.

    Pick the Type of Air Conditioner You Want

    There are different types of AC systems, each suitable for various needs and home configurations. A split-system air conditioner is the most common type, featuring an outdoor unit and an indoor unit. A ductless air conditioning system is ideal for homes without ductwork, with individual units for each room. A packaged air conditioner contains all components in a single outdoor unit, using ductwork to cool the home.

    Check SEER and BTUh Ratings

    Understanding energy efficiency and cooling capacity ratings is crucial. The SEER rating stands for Seasonal Energy Efficiency Ratio, with higher SEER ratings indicating better energy efficiency. Look for units with a SEER rating of 15 or higher.

    The BTUh rating, which stands for British Thermal Units per Hour, measures the unit’s cooling capacity. One ton of air conditioning is equal to 12,000 BTUs. 

    Consider Your Home’s Square Footage and Other Related Factors

    Square footage is a primary factor in determining the size of your AC unit. For a home between 600 and 1,000 square feet, you’ll need a 1.5-ton unit. For 1,000 to 1,500 square feet, a two-ton unit is appropriate. A home between 1,500 and 2,000 square feet requires a three-ton unit.

    If your home is between 2,000 and 2,500 square feet, you’ll need a four-ton unit. Lastly, for homes between 2,500 and 3,300 square feet, a five-ton unit is necessary. However, other factors also influence the required AC size. Better insulation quality reduces the need for a larger unit.

    Homes in hotter climate zones may need more powerful AC units. More windows or south-facing windows increase cooling needs, as do higher ceilings, which increase the volume of air needing cooling. 

    Get an Energy Audit

    For the most accurate sizing, consider having a Manual J calculation done through an energy audit. This professional assessment takes into account all the factors mentioned above to determine the exact AC size you need. Many utility companies offer these audits for free, or you can hire an HVAC technician to perform one.

    Find Your Perfect AC Unit With Trammell Heating & Air

    Answering the question, “How big of an AC unit do I need?” involves considering your home’s square footage, insulation quality, climate zone, and other factors. By following the steps outlined in this guide, you can ensure that you select the right AC unit for optimal comfort and energy efficiency.

    At Trammell Heating & Air, we offer comprehensive services to improve your indoor air quality and ensure your HVAC system runs efficiently. Call Trammell Heating & Air at 770-925-5506 to get started. We proudly serve Athens, GA, and the surrounding areas.

    More To Explore

    Trammell's Discounts and Specials

    Whether you're looking for a simple repair or a complete air conditioning system upgrade, we're here to help.

    Trammell Heating and Air Service Areas

    The #1 Rated HVAC Company serving Buford, Georgia and the surrounding northeast Metro Atlanta communities


    Your Comfort Is Our Specialty!

    Whether you're looking for a simple repair or a complete air conditioning system upgrade, the Trammell Heating & Air Team is here to help.