Your air conditioner always seems to quit at the worst possible time — a 95-degree afternoon when the house won't budge below 80. Standing in front of a unit that's blowing warm air or clicking on and off every few minutes, most homeowners in Aurora, Centennial, and Parker land on the same question: do I repair this, or is it finally time to replace it?

There isn't one universal answer, but there is a clear way to reason through it. This is the same framework our technicians use on service calls across the south metro.

Start with how old the system is

A well-maintained central AC lasts roughly 12 to 15 years on the Front Range. If yours is under 10 and has been serviced regularly, a repair is almost always the smarter money — you're keeping a system that still has years of life left. Past the 12-year mark, the math shifts. Parts get harder to find, efficiency has already slipped, and one repair tends to be followed by another.

Don't know the age? Look for the manufacture date on the data plate on the outdoor condenser. If the label is faded, the first four digits of the serial number are often the week and year it was built.

Run the repair against the 50% rule

A simple gut-check technicians use: if a single repair costs more than half the price of a new system, replacement usually wins. A 400-dollar capacitor on an 8-year-old unit is an easy yes to repair. A 2,500-dollar compressor on a 14-year-old system is not — you'd be putting a major investment into equipment that's near the end anyway. Multiply the repair cost by the age of the unit, too. The higher that number climbs, the more replacement makes sense.

Pay attention to the refrigerant

This matters more than it used to. Systems built before 2010 often run on R-22, which has been phased out — what little is left is expensive, so a refrigerant leak on an R-22 system can cost more to recharge than the repair is worth. Newer systems now use A2L refrigerants like R-454B, and the rules around repairs changed as of 2026. If your unit is on older refrigerant, that alone can tip the decision toward replacement. We broke down the details in our guide to the new A2L refrigerant rule.

Read your energy bills

An AC losing efficiency shows up on your Xcel bill before it shows up as a breakdown. A 15-year-old unit might run at 10 SEER; a new SEER2 system can be nearly twice as efficient. Across a hot Colorado summer where the AC runs hard from June through September, that gap adds up fast — often enough to offset a real chunk of the replacement cost over the life of the system.

When repair is clearly the right call

• The system is under 10 years old and has been maintained.

• It's a first-time failure of a common part — capacitor, contactor, or fan motor.

• The refrigerant is a current type and there's no major leak.

• The repair comes in well under half the cost of replacement.

When replacement usually wins

• The unit is 12-plus years old and breaking down repeatedly.

• It runs on R-22 and needs refrigerant.

• The compressor has failed.

• Your bills have been climbing and rooms never quite get comfortable.

A note for Aurora, Centennial & Parker homeowners

Homes across the south metro share a few quirks worth factoring in. Systems here work hardest in a compressed cooling season, then sit idle through a long winter — that stop-start pattern is tough on aging components, so failures tend to cluster in the first real heat wave of the year. Newer neighborhoods in Parker and southeast Aurora often have two-story floor plans where a single aging AC struggles to keep the upstairs comfortable, which is worth weighing if you're already thinking about replacement. And at 5,500-plus feet, equipment is slightly derated for altitude, so correct sizing on a new system matters more here than it does at sea level.

FAQs

How long should an AC last in Colorado?

About 12 to 15 years with regular maintenance. The dry climate is easy on some components, but the concentrated summer workload ages others faster, so annual service makes a real difference.

Is it worth replacing just the outdoor unit?

Usually not on its own. The outdoor condenser and indoor coil are matched as a system. Replacing only half often leaves you with a mismatched pair that runs inefficiently and can void the new unit's warranty.

What's the most common summer AC repair you see?

Failed capacitors and low refrigerant top the list. Both are common after a system sits all winter and then gets pushed hard on the first 90-degree day.

Can I get a rebate on a new system?

Often, yes. Colorado and federal incentives can meaningfully lower the cost of a high-efficiency replacement — see our overview of 2026 HVAC rebates and tax credits.

Not sure which way your system leans? A straight-answer diagnostic beats guessing. Schedule a visit and we'll give you the honest repair-or-replace math for your home — no pressure either way.