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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.

Get a Repair vs. Replace Recommendation

This calculator weighs age, repair cost, breakdown history, efficiency concerns, and local climate demand. It is not a substitute for an in-person diagnosis, but it gives you a clear starting point before you approve an expensive repair.

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

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

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Leave blank and we will use typical installed cost ranges.

How This Calculator Works

1. The $5,000 Rule Multiply system age by repair cost. If the result exceeds $5,000, replacement often deserves serious consideration.
2. Remaining Useful Life The closer the equipment is to expected end-of-life, the less sense a major repair makes.
3. Comfort and Efficiency Rising bills, uneven rooms, and poor performance add weight toward replacement.
4. Climate Demand Equipment in extreme heat or cold works harder, so aging systems carry more risk.

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.

Typical Installed Replacement Cost Ranges

Central AC: $4,500-$9,500 installed depending on size, SEER2 rating, and coil needs.

Furnace: $4,000-$8,500 installed depending on fuel type and AFUE efficiency.

Heat pump: $6,000-$13,500 installed depending on capacity and cold-climate performance.

Full HVAC system: $9,000-$18,000+ for matched furnace and AC replacement.

Actual pricing varies by home size, ductwork condition, electrical work, permit requirements, and contractor labor rates.

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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 estimates 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.