Getting the right AC size is critical. An oversized unit cools too quickly, short-cycles, wastes energy, and leaves your home humid. An undersized unit runs constantly, can't keep up on hot days, and wears out prematurely. Here's how to determine the right size for your home.
Understanding AC Sizing (Tons and BTUs)
AC capacity is measured in tons or BTUs per hour. One ton equals 12,000 BTUs of cooling capacity. Residential systems typically range from 1.5 to 5 tons.
The Quick Estimate Method
A rough estimate uses 1 ton per 500–600 square feet in Georgia's climate:
Important: This is only a rough estimate. The actual size depends on many factors beyond square footage.
Why Square Footage Alone Isn't Enough
Two 2,000-square-foot homes can have vastly different cooling needs based on:
The Right Way: Manual J Load Calculation
The only accurate way to size an AC system is a Manual J load calculation. This engineering analysis considers every factor that affects your home's cooling load and produces a precise capacity recommendation.
At All Seasons, we perform Manual J calculations for every installation. It takes about 30 minutes during our in-home consultation and ensures your new system is sized perfectly.
The Danger of Oversizing
Many contractors oversize systems "just to be safe." This is actually harmful:
Get It Right the First Time
A properly sized AC system runs in longer, steadier cycles — providing better comfort, lower humidity, lower energy bills, and a longer system life. Don't trust a contractor who sizes your system based on square footage alone.
Need help sizing a new AC? Call All Seasons at (770) 809-1355 for a free in-home consultation with proper load calculations. Serving Carrollton, Villa Rica, and Newnan.