AC Sizing Calculator
Find the right AC size for your home based on square footage, climate, and other factors.
AC Sizing Calculator
Enter your home details for an AC size recommendation.
Frequently Asked Questions
What size AC do I need for my house?
A general rule is 1 ton (12,000 BTU) per 500–600 sq ft, adjusted for climate. A 2,000 sq ft home in a hot climate typically needs a 3.5–4 ton unit, while the same home in a mild climate needs 3–3.5 tons.
What happens if my AC is too small?
An undersized AC runs continuously, cannot cool the home on the hottest days, and leads to high energy bills and excessive wear. It may also struggle with humidity control.
What happens if my AC is too big?
An oversized AC cools too quickly and short-cycles, leading to poor humidity removal, uneven temperatures, higher energy bills, and premature compressor failure.
What is a Manual J calculation?
Manual J is the HVAC industry standard for calculating heating and cooling loads. It considers 8+ factors including square footage, insulation, windows, orientation, climate, and occupants. Our calculator uses a simplified version.
Does insulation affect AC sizing?
Significantly. A well-insulated home with good windows may need 25–30% less cooling capacity. Improving insulation before replacing your AC can mean buying a smaller, more efficient system.
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