When your AC breaks down, you'll hear plenty of quick rules: replace it at 10 years, replace it when the repair costs half as much as a new one, replace it after you've spent a certain amount on repairs. Those shortcuts sound decisive, but they skip the facts that actually matter for your system. Here's how our technicians help Columbia homeowners make the call.

Start with an honest diagnosis

Warm air, high bills, ice, noise and short-cycling don't point to one specific part. Before comparing repair and replacement, you need to know what actually failed and how the technician confirmed it. Ask what they tested, what else they ruled out and whether the repair fixes the cause or just the symptom.

Then get two written prices side by side: the repair (with parts, labor, exclusions and warranty) and the replacement (with exact models, sizing, efficiency, any duct or electrical work, permits and warranties). Comparing a detailed replacement quote to a vague repair number isn't a fair fight.

How our technicians weigh repair vs. replace

  • The failure: Is it an isolated part like a capacitor or contactor, or a major component like the compressor or coil?

  • Everything else: Will the system be in good shape after the repair, or are other parts wearing out too?

  • Repair history: Is it the same problem coming back, or unrelated wear over the years?

  • Comfort: When it runs right, does it keep up with Columbia heat and humidity?

  • Parts and refrigerant: Are the parts available, and what does the refrigerant cost for this repair?

  • Your plans: How long will you stay in the home, and how much does another breakdown matter for your household?

If a single repair puts a basically healthy system back in good shape, repair usually wins. If the repair is major, other parts are failing and comfort has never been great, replacement starts to make sense. Either way, the choice is yours.

Age is context, not a verdict

Older systems are more likely to need repairs and harder to find parts for, but two 12-year-old systems can be in very different shape depending on installation, maintenance and run time. There's no rule that says 10 years means replace.

What about the refrigerant?

R-22 systems

New R-22 hasn't been produced or imported since 2020. These older systems can still be serviced with reclaimed refrigerant, but it's expensive — so a major R-22 leak often tips the scale toward replacement.

R-410A systems

Still legal to run and repair. The federal phase-down reduces supply over time; it doesn't require you to replace a working system. "R-410A is banned" is not a reason to replace. See our R-410A guide.

New systems

New AC systems use R-454B or R-32. These aren't drop-in replacements for older refrigerants — a new system means new matched equipment.

Efficiency: real, but not guaranteed

A new system will likely use less energy than a worn-out one, but actual savings depend on sizing, ductwork, installation, thermostat habits, weather and rates. In South Carolina, new split-system ACs must meet at least 14.3 SEER2 (under 45,000 Btu/h) or 13.8 SEER2 (larger systems). Learn more in our SEER2 guide.

The federal 25C tax credit ended for installations after December 31, 2025, but Dominion Energy South Carolina residential electric customers may qualify for utility rebates on ENERGY STAR systems.

If you replace, size it right

A new system should be sized for your home, not copied from the old nameplate. Oversized units short-cycle and leave the house clammy; undersized ones can't keep up in July. Ask how the size was chosen and how ductwork, return air, drainage, electrical and thermostat compatibility will be handled.

Your decision checklist

  • What failed, and how was it confirmed?

  • What will the repair fix, and what concerns remain?

  • What exactly does each replacement quote include?

  • What are the warranties on each option?

  • What's the total cost, paying cash or financing?

If the AC is out and your home is dangerously hot, move vulnerable family members and pets somewhere cool first. The long-term decision can wait a day.

Want an honest opinion? On Call's NATE-certified technicians have served Columbia since 2011 and install primarily Trane. Our residential diagnostic fee is $89, waived when you go ahead with the repair, and you'll get firm prices for repair and replacement before any work begins. If replacement makes sense, your technician can walk you through financing in person. Learn more about AC repair and AC replacement, call (803) 781-4357 or request service online.