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Should You Repair or Replace Your HVAC System?

Use the industry "5,000 Rule" to make an informed repair vs. replace decision based on your system's age and the repair cost.

HVAC Repair vs. Replace Calculator

Uses the industry "5,000 Rule" — multiply system age by repair cost to decide.

Find on the unit's nameplate or service sticker.

Average central AC replacement: $4,500–$8,500. Use your contractor quote if available.

What you spend annually on service calls and maintenance. Leave blank if unknown.

What do you do with these numbers?

Bring your estimate to a free conversation with a verified HVAC pro in your city.

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Why Use This Tool?

The 5,000 Rule gives you a quick, objective framework: multiply system age by repair cost. Above 5,000 -- replace. Below 3,000 -- repair. This calculator applies the rule and shows a 5-year cost comparison so you can make a confident decision without pressure from a contractor.

About This Tool

When an HVAC tech quotes you a repair, the question is always: is this worth it? The "5,000 Rule" is the most widely used framework in the HVAC industry for answering that question objectively. It was popularized by Consumer Reports and is used by contractors and homeowners nationwide. Multiply the system's age (in years) by the estimated repair cost. If the result exceeds 5,000, replacement typically makes more financial sense.

How It Works

1
Enter your system age

The manufacturing date is on the unit's nameplate (usually a silver sticker on the outdoor unit). A licensed technician can also determine age from the serial number.

2
Enter the repair quote

Use the quote from your HVAC technician for the current repair. Do not include service call fees -- just the repair cost itself.

3
Enter the estimated new system cost

Use a replacement quote if you have one. The default ($6,500) is the US average for central AC replacement (installed).

4
See your 5,000 Rule score and 5-year comparison

The calculator shows your score, a clear repair vs. replace recommendation, and a side-by-side 5-year cost comparison.

Cost Context

The average central AC replacement costs $4,500-$8,500 installed. A $1,200 repair on a 12-year-old system scores 14,400 on the 5,000 Rule -- well above the replace threshold. A $400 repair on a 6-year-old system scores 2,400 -- clearly worth fixing.

Frequently Asked Questions

What is the 5,000 Rule for HVAC?
Multiply your HVAC system's age (years) by the cost of the current repair. If the result is greater than $5,000, replacement is typically the smarter financial move. Example: a 12-year-old system with a $600 repair = 7,200 (replace). A 5-year-old system with a $400 repair = 2,000 (repair).
When should you replace rather than repair HVAC?
Replace when: (1) System is 15+ years old; (2) Repair cost exceeds 50% of a new system; (3) 5,000 Rule score exceeds 5,000; (4) This is the second major repair in 2 years; (5) The system uses R-22 refrigerant (phased out, expensive to recharge); (6) Utility bills have increased significantly (declining efficiency).
Is it worth repairing a 15-year-old air conditioner?
Generally no, for any repair above $333 (15 x $333 = ~$5,000 threshold). A 15-year-old system is nearing end of life, running at 70-80% original efficiency, and parts are increasingly difficult to source. Modern SEER 16-20 replacements also save $200-$500/year in electricity.
Should I repair or replace a 10-year-old HVAC?
It depends on repair cost. A 10-year-old system has 5-10 years of useful life remaining. A $300 repair = 3,000 (repair). A $500 repair = 5,000 (borderline). An $800 repair = 8,000 (replace). Also: is the compressor involved? Compressor replacement on a 10-year-old system rarely makes sense -- total cost approaches a new system.
How long does an HVAC system last?
Central AC systems: 15-20 years. Heat pumps: 15-20 years. Gas furnaces: 20-30 years. Annual maintenance significantly extends lifespan. Systems in hot climates (Phoenix, Houston) trend toward the lower end; mild climates trend toward the upper end.

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