HVAC Size Calculator
Oversized AC units short-cycle and cost more. Get an honest ballpark for cooling BTU, heating BTU, and tonnage before your HVAC bid.
6-ton system (heating-limited)
recommended system
Temperate (Zone 4)
Sizing results
Cooling BTU
60,564
Heating BTU
70,000
Cooling tons
5
Heating tons
6
Recommended
6-ton system (heating-limited)
Climate
Temperate (Zone 4)
Freedom Coach™
You need ~6-ton system (heating-limited) (60,564 BTU cooling / 70,000 BTU heating).
Sized for Temperate (Zone 4), average insulation, average sun. Rule of thumb only — pay for a Manual J load calc before install.
Premium
Save sizing scenarios for each zone or building — great for landlords and contractors.
Unlock PremiumBy BTU/hr and tonnage. 1 ton = 12,000 BTU. A proper Manual J load calculation factors square footage, ceiling height, insulation, windows, orientation, and climate zone.
Roughly 3–4 tons in most US climates. Hot, sunny homes push toward 4 tons; well-insulated homes in mild climates need only 2.5–3.
Oversized ACs short-cycle — they cool the temperature fast but don't run long enough to dehumidify. You get cold, clammy air, higher bills, and premature compressor wear.
SEER2 rates cooling efficiency. Every 2-point jump saves ~10–15% on cooling bills. A 16 SEER2 unit usually pays back the upgrade cost vs. 14 SEER2 within 4–7 years.
Yes if you're replacing the system. Rule-of-thumb sizing is wrong 30–50% of the time. A proper Manual J costs $150–$400 and can save $3–8K in wrong-size penalties.
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