AC & Furnace Sizing Calculator
Estimate the heating and cooling capacity your home needs. Right-sizing matters — an oversized system short-cycles and wastes energy, while an undersized one struggles on peak days.
What Size AC & Furnace Do You Need?
Your local climate changes the heating and cooling load for your home. This estimate uses a national mixed baseline — for a location-specific result, open your state page. Enter your details for a quick sizing estimate (BTU, tonnage and a recommended SEER2 range).
Actual equipment sizing requires a professional Manual J load calculation. This tool provides a rough estimate for general informational purposes only and is not professional advice, a guarantee, or a quote. Results may not reflect your specific situation. Always confirm with a licensed HVAC professional before making any purchase or decision. See our Terms of Service for details.