HVAC Replacement Cost Calculator

HVAC replacement cost = base price by tonnage × system type multiplier (AC, heat pump, furnace+AC).

Inputs

Result

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How to use this calculator

  • Get tonnage from existing nameplate or use Manual J load.
  • Pick system type matching your home.
  • Pick SEER tier — code minimum is 14 (Northern) or 15 (Southern) as of 2023.
  • Toggle ductwork if existing ducts are leaky or undersized.

About this calculator

1 ton of AC = 12,000 BTU/hr; rule of thumb is 1 ton per 500-600 ft² in moderate climates. A 2,000 ft² home typically needs a 3-3.5 ton system. Equipment + install runs ~$1,500/ton for SEER 14 split AC, ~$2,700/ton for furnace+AC combo. SEER bumps add 15-60% but pay back in 7-12 years through utility savings. Ductwork replacement is the wild card — old returns or undersized supplies need redoing during a system swap.

Frequently asked

How do I size HVAC?+
Don't guess from square footage alone — get a Manual J load calc. Oversized systems short-cycle, undercool, and shorten lifespan.
What's SEER2?+
SEER2 is the 2023 testing standard (replaces SEER). SEER2 14.3 ≈ old SEER 15. New ratings are slightly more conservative.
Heat pump vs. furnace?+
Heat pumps are now efficient down to 0°F+ with cold-climate models. They cost more upfront but eliminate gas bills. Heat pump tax credits run through 2032.
How long does install take?+
Like-for-like swap: 1 day. With ductwork or system change: 2-4 days.
Permits required?+
Yes — refrigerant work requires EPA 608 cert and most jurisdictions pull a mechanical permit. Ask for the permit number on the quote.

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