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🔧Repair or Replace Calculator

Should You Repair or Replace Your HVAC System?

Enter your system details to get a data-based recommendation — repair your current unit or invest in a replacement.

Enter Your System Details

Check your thermostat, unit label, or home inspection report if unsure.

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Use the quote from your technician, or your best estimate.

How This Calculator Works

  • •The $5,000 Rule: Multiply your system's age by the repair cost. If the result exceeds $5,000, replacement usually makes more financial sense.
  • •System Lifespan: Central AC and heat pumps last 15 years on average. Gas furnaces typically last 20 years. After this point, efficiency drops and repair frequency increases.
  • •Frequency Factor: A system that breaks down repeatedly is a sign of systemic decline — each repair buys less and less additional life.

This tool provides general guidance only. Always get a professional assessment before making a final decision.

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The Repair vs. Replace Decision — What You Need to Know

The decision to repair or replace your HVAC system is one of the biggest home maintenance choices you'll make. It affects your comfort, energy bills, and budget for years to come. Here are the key factors HVAC professionals use to guide this decision.

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Age of the System

Furnaces typically last 15–20 years; central AC units 10–15 years; heat pumps 10–15 years. If your system is within 3–4 years of end-of-life and needs a significant repair, replacement almost always makes more financial sense.

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The $5,000 Rule

Multiply the system's age (in years) by the repair cost. If the result exceeds $5,000, replacement is generally the better investment. Example: a 12-year-old system needing a $500 repair = $6,000 — lean toward replacing.

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Energy Efficiency

Systems over 10 years old often have SEER ratings of 8–10. Modern systems run at 16–20+ SEER. The energy savings from a new system can offset the cost difference within 5–7 years, especially in climates with extreme summers or winters.

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Repair History

If you've had 2 or more significant repairs in the last 2 years, or if the same component keeps failing, you're likely funding a system that has reached the end of its reliable service life.

Repair or Replace — Frequently Asked Questions

How much does a new HVAC system cost to install?
A new central AC unit installation typically costs $3,500–$7,500 depending on size and efficiency rating. A full HVAC system (furnace + AC) replacement runs $7,000–$15,000 installed. Heat pump systems range from $5,000–$12,000. Get at least 3 quotes from licensed local contractors before deciding.
Is it worth repairing a 10-year-old AC unit?
A 10-year-old unit is roughly two-thirds through its expected lifespan. Minor repairs (capacitor, contactor, refrigerant charge) are usually worth it at this age. Major repairs (compressor replacement, full coil replacement) costing $1,000 or more generally are not — you're investing heavily in a system nearing the end of its life.
What are signs that my HVAC system needs to be replaced rather than repaired?
Key replacement indicators: the system is over 12–15 years old; you've had multiple repairs in the past 2 years; energy bills are significantly higher than they used to be; the system uses R-22 refrigerant (no longer manufactured); rooms heat or cool unevenly despite repairs; the compressor has failed.
Does a new HVAC system increase my home's value?
Yes. A new HVAC system typically adds $2,500–$5,000 to home resale value and is a strong selling point for buyers. More importantly, it's a required disclosure in most states — a failing system can kill a home sale or require a significant price reduction.