BeforeQuote

HVAC Replacement Cost Calculator

Use the HVAC replacement cost calculator to estimate central AC, furnace, heat pump, or full HVAC system replacement costs.

HVAC Replacement Cost Calculator

Estimate HVAC replacement costs by home size, system type, efficiency, ducts, and complexity.

sqft

HVAC replacement costs depend on system size, equipment type, efficiency, duct condition, access, and code requirements. This calculator uses home square footage to estimate tonnage, then layers in equipment and installation factors.

How this estimate is calculated

The planning formula uses this model: estimated tons = rounded home square footage / 500; total = tonnage x system base rate x efficiency, local, and complexity multipliers + ductwork + electrical.The output is shown as a low, typical, and high range so you can compare assumptions instead of treating one number as a quote.

Planning notes

  • A proper load calculation is better than square-foot rules. Use this result as a planning estimate, not equipment sizing advice.
  • Duct repairs, electrical upgrades, gas line changes, and attic access can significantly affect the bid.
  • This estimate excludes geothermal systems, mini-split multi-zone design, asbestos abatement, and major envelope improvements.

Factors that change the price

  • Home size and actual load requirement
  • System type and efficiency
  • Ductwork condition
  • Electrical, gas, condensate, and code updates
  • Access to attic, crawlspace, roof, or mechanical room

DIY vs hiring a pro

DIY can reduce labor cost for simple, low-risk work, but the savings disappear when a project needs permits, structural changes, licensed trades, waterproofing, gas, electrical, roof access, or specialized tools. Use the calculator to understand the scope, then ask contractors to explain which assumptions are included in their bids.

Frequently asked questions

Is square footage enough to size HVAC equipment?

No. Square footage is only a rough planning input. Contractors should perform a load calculation that considers insulation, windows, climate, air leakage, orientation, and occupancy.

Should I replace ducts with a new HVAC system?

If ducts are leaky, undersized, damaged, poorly insulated, or contaminated, duct repairs or replacement can improve comfort and system performance.

BeforeQuote estimates are for planning only. Actual project costs depend on your location, materials, contractor availability, site conditions, permits, and final scope.