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Should You Repair or Replace Your HVAC System?

A new HVAC system can cost $5,000 to $28,000. Use your system's age, repair cost, and refrigerant type to decide whether fixing it still makes sense.

By AssistQuote Editorial Team

Published September 24, 2026 · Updated September 30, 2026 · 3 min read

Quick answer

Repair it if the system is fairly young and the fix is small. Think about replacing it if it's old, needs a big repair, breaks often, or uses R-22 refrigerant. A simple rule of thumb: multiply the system's age by the repair cost. If it's over $5,000, replacing often makes more sense.

What replacement costs

A full HVAC replacement costs about $5,000 to $28,000. For a typical 2,000-square-foot home, most people pay about $7,000 to $20,000. New ductwork can add about $3,000. That's a big number, so it's worth deciding carefully.

Warning signs your system is near the end

  • Repairs keep coming, and each one costs more
  • Energy bills keep rising
  • Some rooms stay too hot or too cold
  • Strange noises, smells, or short on-off cycles
  • It uses R-22 refrigerant and has a leak

Five questions to help you decide

1. How old is it? Central AC units usually last about 15 to 20 years with good care. An older system is more likely to keep breaking. Check the label on your outdoor unit or furnace for the date.

2. How big is the repair? Small fixes, like a capacitor or a thermostat, usually make sense even on an older system. Big ones, like a compressor or a heat exchanger, can cost a large share of a new system.

3. Does it use R-22 refrigerant? Many AC systems made before 2010 use R-22. The U.S. stopped making and importing new R-22 on January 1, 2020. You can keep using your system, but refilling R-22 now depends on recycled supplies, and it can be costly. If an R-22 system has a leak, replacing it often makes more sense. Check the label on your outdoor unit.

4. How often does it break? If you've called a repair tech more than once or twice in the last couple of years, those bills add up.

5. Is your home comfortable? Rooms that are too hot or cold, high humidity, or high energy bills can mean your system is failing, or it was the wrong size to begin with.

The $5,000 rule of thumb

Multiply the age of your system by the repair cost.

  • A 12-year-old system with a $500 repair: 12 × $500 = $6,000. Replacing is worth a serious look.
  • A 5-year-old system with a $400 repair: 5 × $400 = $2,000. Repairing probably makes sense.

It's just a starting point, not a hard rule. But it helps you think clearly when a tech is standing in your kitchen.

What a good repair tech should tell you

Ask for the repair price in writing, what caused the problem, whether other parts are close to failing, and what a replacement would cost for comparison. An honest tech will tell you when a repair still makes sense.

If you replace, get the size right

A bigger system isn't better. A system that's too big turns on and off too much, wears out faster, and leaves your home damp. Ask every contractor to do a Manual J load calculation. It figures out the right size for your home. Don't let anyone size a new system just by matching your old one.

Ask about rebates

Many federal energy tax credits ended after 2025. But your power or gas company, or your state, may still offer rebates. Ask before you sign. Paying over time? Compare a HELOC. Want coverage for future repairs? See home warranties.

Related pages

More home systems: HVAC · Water heaters · Tankless water heaters · Plumbing · Electrical · Generators · Insulation · Solar · Water treatment · All home projects

More heating and cooling guides: HVAC replacement cost · Furnace replacement · AC replacement · Heat pumps · Insulation

Questions people ask

Repair if it's fairly young and the fix is small. Consider replacing if it's old, needs a major repair, breaks often, or uses R-22.

Multiply the system's age by the repair cost. If the result is over $5,000, replacing often makes more sense.

Central AC units usually last about 15 to 20 years with good care.

Yes, but new R-22 is no longer made or imported in the U.S., so refills rely on recycled supply and can be costly.
AssistQuote may earn money when you use certain links or do business with a participating provider. This may affect which providers you see and where they appear. Providers set their own prices and terms. Compare your options before you decide.

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