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Calculator Methodology

How the HVAC Repair vs Replace Calculator estimate works

The right answer changes when a repair is expensive, the system is old, comfort is poor, or energy waste is recurring.

This estimate is for planning. Actual results may change based on local pricing, contracts, title practice, lender disclosures, insurance documents, inspection findings, hidden conditions, timing, and professional review.

Use the calculator Build decision packet

Inputs used

Defaults are planning placeholders, not recommendations.

Current repair quote
Default: 1800 $
System age
Default: 13 yrs
Replacement estimate
Default: 11500 $
Estimated annual energy penalty
Default: 450 $
Comfort problem severity
Default: 6 /10

What is included

  • The visible inputs listed on the calculator page.
  • The assumptions shown below the calculator.
  • A planning estimate based on the calculator family, not a binding quote, contract, appraisal, insurance settlement, title statement, or lender disclosure.
  • Input: Current repair quote.
  • Input: System age.
  • Input: Replacement estimate.
  • Input: Estimated annual energy penalty.
  • Input: Comfort problem severity.

What is excluded

  • Final contractor pricing, local permit interpretation, lender underwriting, title-company settlement, insurance claim approval, tax advice, legal advice, or property-specific professional judgment.
  • Every local custom, contract term, hidden condition, inspection finding, market shift, and timing issue.
  • Guaranteed savings, resale value, coverage, approval, or final cash due.
  • Full Manual J design, in-person HVAC diagnosis, roof inspection, structural inspection, code inspection, or contractor warranty review.

What can make the estimate too low

  • Hidden damage, access difficulty, permit/code requirements, disposal, electrical, gas, duct, decking, flashing, ventilation, or warranty scope is not included.
  • The quote is a low base price with change orders likely.
  • Emergency timing reduces quote leverage.

What can make the estimate too high

  • A narrower repair, partial replacement, roof-over, owner-supplied material path, rebate, or scope trim is safe and documented.
  • Access is easier, hidden conditions are absent, or the project is bundled efficiently.
  • A second quote proves the first quote included unnecessary scope.

Assumptions

  • This is a decision frame, not a diagnosis.
  • A safety issue, cracked heat exchanger, or major refrigerant leak may override pure payback math.

When to verify before acting

  • Before signing a contractor quote, purchase contract, listing agreement, loan document, title document, insurance claim document, or association document.
  • When a result depends on local custom, contract language, code, warranty, hidden conditions, eligibility, or professional judgment.
  • When the result changes whether you repair, replace, sell, buy, claim, finance, or walk away.