The compressor is out, the quote is uncomfortable, and the technician has just asked whether you want to repair it or start talking about a new system. Most homeowners make this decision once or twice in a lifetime, usually under pressure, in July.
There is a reasonably objective way to work through it. These are the factors that actually decide the answer, in the order a good technician weighs them.
The two rules of thumb technicians use
The first is the 5,000 rule. Multiply the age of the system in years by the cost of the proposed repair. If the result clears 5,000, replacement is usually the better financial call. A 6-year-old unit needing a 400 dollar repair scores 2,400 and gets fixed. A 16-year-old unit needing a 900 dollar repair scores 14,400 and does not.
The second is simpler. If a single repair costs more than about half of what a new system would, replacing makes more sense than sinking that money into aging equipment.
Neither rule is absolute. Both cut through a stressful conversation and get you to a number you can reason about.
Age, and why Las Vegas shortens it
Manufacturers generally quote a service life of 15 to 20 years for central air conditioning. That figure assumes a moderate climate and consistent maintenance.
Southern Nevada delivers neither. Systems here run far more hours per year than the same equipment would in a mild climate, under higher head pressure, with dust loading the outdoor coil. A realistic expectation locally sits closer to 12 to 15 years, and units that were neglected reach the end sooner.
Age alone does not condemn a system. A well-maintained 14-year-old unit that still cools properly is worth keeping, and consistent HVAC maintenance is the single largest factor in whether equipment reaches the top of its range or the bottom.
Which refrigerant your system uses
This is the factor most homeowners have never considered, and on older equipment it often decides the question by itself.
Systems installed before roughly 2010 typically use R-22, which has not been produced or imported in the United States since 2020. Service on an R-22 system now depends on reclaimed supply, and prices can be significantly higher. A leak repair on older R-22 equipment can cost more than the system is worth, which can shift the decision toward replacement.
Newer systems commonly use R-410A, and here the picture is widely misreported. R-410A is not simply “illegal” in existing equipment. Manufacturers stopped building new residential split systems with it beginning January 1, 2025, as part of the federal HFC phase-down, while newer equipment uses lower-GWP refrigerants such as R-454B in many ducted systems and R-32 in many ductless systems. Existing equipment remains subject to different rules and can continue to be serviced under applicable requirements.
If your business relies on temperature-sensitive inventory or commercial cooling equipment, choosing an experienced Commercial Refrigeration Repair provider can help you evaluate refrigerant availability, repair costs, equipment condition, and whether replacement makes financial sense.
When repair is the right answer
- The system is under about ten years old and has been maintained.
- This is the first significant failure, not the third call this summer.
- The failed component is covered by a parts warranty, which on many systems runs ten years when registered.
- Energy bills have been steady, adjusted for weather and rate changes.
- The repair is a capacitor, contactor, motor, or control board rather than the compressor or coil.
Most midsummer calls fall into this category. An AC repair visit that restores a healthy system for a few hundred dollars is a good outcome, and a technician who reaches straight for a replacement quote without diagnosing properly is worth a second opinion.
When replacement is the right answer
- The unit is past fifteen years and needs a substantial repair.
- The compressor has failed and is out of warranty. This is the most expensive component, and on old equipment it is rarely worth replacing alone.
- You have paid for two or more repairs in a single cooling season.
- The system uses R-22 and has a refrigerant leak.
- Bills keep climbing while comfort gets worse, which usually means efficiency has degraded.
- Rooms cool unevenly and the system runs constantly even on moderate days.
Efficiency is the part people underestimate. Equipment from the early 2000s often operated in the range of 8 to 10 SEER, while current systems are substantially higher, so a Las Vegas household running cooling eight months a year can recover a meaningful share of the difference through lower bills. Our AC installation team sizes replacements to the home instead of matching whatever was there before.
What should happen before anyone quotes a system
A replacement quote produced without a diagnosis is a sales pitch. Before that conversation, a technician should have measured refrigerant pressures on both sides, checked the electrical components under load, inspected the coils, and confirmed airflow. You should be told what failed, why, and what the repair would cost, even when replacement is the recommendation.
Ask for the repair figure in writing alongside the replacement quote. Ask what the warranty covers on both. Then decide with numbers in front of you. If the timing is difficult, financing options exist precisely because these decisions rarely arrive at a convenient moment.
Frequently asked questions
How long should an AC last in Las Vegas?
Expect 12 to 15 years for a well-maintained system in this climate, against the 15 to 20 years manufacturers quote for moderate regions. Run hours and heat are the reason. Annual service moves a unit toward the top of that range.
Is it worth replacing just the outdoor unit?
The outdoor condenser and indoor coil are designed as a matched set, and pairing a new condenser with an old coil typically means lost efficiency, possible warranty issues, and a mismatch that underperforms.
My AC uses R-410A. Do I have to replace it?
No. An installed R-410A system remains legal to run and to service, and refrigerant is still available. Only new equipment manufacturing changed in 2025.
Does a new system really lower my power bill?
It generally does, and the size of the savings depends on what you are replacing. A jump from twenty-year-old equipment to a modern high-efficiency system produces a much larger change than upgrading a ten-year-old unit.
Should I replace before the system fails?
Planned replacement is almost always the better experience. You compare options, take advantage of off-peak scheduling, and avoid deciding during a July breakdown with the house at 90 degrees.
Conclusion
Most of this decision comes down to four things: how old the system is, what the repair costs relative to replacement, what has happened to your energy bills, and which refrigerant is in the lines. Work through those honestly, and the answer is usually clear before anyone quotes anything.
Our technicians hold NATE certification and the company is an authorized Trane dealer, but the part that matters here is simpler: you get the repair number alongside the replacement number, so the choice stays yours. Call (702) 291-2000 or schedule an appointment for a straight diagnosis.
