HVAC Guides
Repair or Replace Your AC? How to Decide
The decision comes down to three numbers: the system's age (central AC lasts 15 to 20 years), the repair cost, and the $5,000 rule — repair cost multiplied by age in years. Under $5,000, repair. Over it, the money is usually better spent on replacement.
Cal Climate Corp has installed and repaired Los Angeles AC systems since 1968 under California license #265735, and provides free in-home replacement consultations with proper load calculations.
When is repairing an AC the right call?
Repair wins when the system is under 10 years old, the failure is a single component (capacitor, fan motor, thermostat, circuit board), and the system has otherwise cooled reliably. Systems in this category typically have years of service left, and a $150-$700 repair preserves that value. Repair is also the right short-term call when a replacement is planned but needs to wait a season.
When does replacement make more sense?
Replacement wins when the system is past 12-15 years and facing a major repair, when it still uses phased-out R-22 refrigerant, when repairs have become a yearly event, or when energy bills have climbed even with maintenance. Modern systems are also meaningfully more efficient — today's SEER2 minimums deliver the same cooling for substantially less electricity than systems installed in the 2000s.
| Factor | Points to repair | Points to replace |
|---|---|---|
| System age | Under 10 years | Over 12–15 years |
| Failed part | Capacitor, motor, thermostat | Compressor, coil, heat exchanger |
| Refrigerant | R-410A or newer | Phased-out R-22 |
| Repair history | First issue in years | Repairs every season |
| Energy bills | Stable | Climbing despite maintenance |
| $5,000 rule | Age x repair cost under $5,000 | Age x repair cost over $5,000 |
What does a new AC system cost in Los Angeles?
A full central air conditioning replacement in Los Angeles typically runs $8,000 to $15,000 installed, depending on system size, efficiency tier, and whether ductwork needs repair or replacement. Heat pumps — increasingly common under California's electrification incentives — land in a similar range. These are planning ranges; an accurate quote requires a load calculation for your specific home, which Cal Climate performs during a free in-home consultation.
How do you actually decide?
Start with a diagnosis, not a sales pitch. Cal Climate's $95 flat diagnostic (waived with repair) produces a written report: what failed, what the repair costs, and the system's age and condition. Apply the $5,000 rule to those numbers. When the math favors replacement, a free consultation with a load calculation sizes the right equipment for your space and budget — not the most expensive option.
Frequently Asked Questions
What is the $5,000 rule?
Multiply the repair quote by the system's age in years. If the result is over $5,000, replacement usually makes more financial sense. Example: a $700 repair on a 6-year-old system is $4,200 — repair it. The same $700 repair on a 12-year-old system is $8,400 — put the money toward replacement.
How long do AC systems last in Southern California?
15 to 20 years for a well-maintained central system. LA's long cooling season puts more hours on compressors than the national average, so systems that skip annual maintenance tend to fail at the early end of that range.
Can I replace just the outdoor unit?
Usually not advisable. Indoor and outdoor coils are engineered as matched pairs; mixing a new condenser with an old indoor coil reduces efficiency, can violate the manufacturer's warranty terms, and often is not permitted under current refrigerant regulations. A load calculation during a free consultation determines what your home actually needs.
Get the Numbers for Your System
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