AC Repair vs. Replacement: How to Know Which One You Need
An air conditioner that cannot keep up in August puts you in front of a decision worth a few thousand dollars. Before you spend that on a new system, it is worth knowing whether a repair will solve the problem, or whether you are about to put a good part into a system that is finished.
The symptom in front of you matters less than three other things: the age of the equipment, the cost of the repair relative to a new system, and whether this is a one time failure or the third one this year.
Our technicians work through the following on every service call. You can do the same before anyone hands you a quote.
Start with what the system is doing
Different symptoms carry very different price tags. Before you think about repair or replacement, put your problem into one of these groups.
It will not turn on at all. This is usually electrical. A tripped breaker, a failed capacitor, a burned contactor, a blown low voltage fuse, or a thermostat that has lost power. These are among the least expensive repairs in HVAC, and usually a same day AC repair.
It runs but the air is not cold. Refrigerant loss, a dirty evaporator coil, a failed compressor, or a condenser fan that has stopped turning. The range here is enormous, from a routine cleaning to the single most expensive repair on the system.
It cools, but not enough, and it never really has. That is usually a design problem, not a failure. Undersized equipment, leaking ducts, or a return that cannot move enough air. Replacing the outdoor unit alone will not fix it.
It cools well, but the bills keep climbing. Gradual efficiency loss. Worth investigating, rarely an emergency.
It leaks water. Almost always a clogged condensate drain. Inexpensive to clear, expensive to ignore, because that water lands on a ceiling.
Note which group you are in before you call anyone. It tells you whether the conversation you are about to have should be a short one.
How long air conditioners last here
A residential air conditioner is generally expected to run 15 to 20 years. In Los Angeles, plan closer to the bottom of that range, and sometimes below it.
The reason is runtime. A system here cools from spring into late fall, and in most homes the condenser sits in direct sun while the ductwork and air handler live in an attic that passes 130 degrees in summer. That is a harder life than the same equipment would have in a milder climate. A well maintained system in the San Fernando Valley reaching year 15 has done its job.
Two things shorten that life more than anything else. The first is skipped maintenance, because a coil that has never been cleaned makes the compressor work against resistance every hour it runs. The second is an oversized system, which short cycles from the day it is installed and never accumulates the run time it needs to dehumidify or to run efficiently.
Age alone does not condemn a unit. But it changes the math on every repair you are quoted.
The repair math
A common industry rule of thumb: multiply the age of the unit in years by the cost of the proposed repair. If the result exceeds roughly five thousand dollars, replacement is usually the better use of the money.
A six hundred dollar repair on a five year old system comes to three thousand. Fix it. The same six hundred dollar repair on a fourteen year old system comes to eighty four hundred, and you are spending real money on equipment that owes you nothing.
Treat it as a guide, not a verdict. A single failed capacitor on an otherwise healthy fifteen year old unit is still worth fixing. Weigh it alongside how many times you have called someone out in the last two summers, and how comfortable the house actually was in between those calls.
One more number belongs in the calculation. If you are quoted a repair and the same technician tells you the system is also low on refrigerant, add the recharge to the repair before you compare. Those two costs arrive together far more often than they arrive separately.
Signs a repair is the right call
The system is under ten years old and this is the first significant failure.
The failed part is a common wear item. Capacitors, contactors, fan motors, thermostats, and condensate pumps are all normal replacements, not signs of a dying system.
Cooling performance was fine until this happened. A system that worked properly last month and stopped suddenly usually has one discrete problem.
Your energy bills have been stable. Steady consumption suggests the equipment itself is still efficient.
The repair is covered, or partly covered, by warranty. Many compressors carry ten year parts coverage. Check before you agree to anything, and have the model and serial numbers ready when you call the manufacturer.
You plan to sell within a year or two. A functioning system that has been repaired is usually the more sensible spend than a new system whose value you will not recover in the sale price.
Signs replacement is the better decision
The unit is twelve to fifteen years or older and needs repeated repairs. Two or more service calls in a season is the clearest signal there is.
The compressor has failed. On an older system this is usually the end. The part and the labor together often approach the cost of new equipment.
Energy bills keep climbing despite tune ups. That is capacity loss, and it does not reverse.
Some rooms have never been comfortable. If the house has always cooled unevenly, the problem may be sizing or ductwork instead of the equipment, and a replacement is the moment to correct it.
The system uses R-22 refrigerant. See below, because this one deserves its own explanation.
You are already planning other work. If the attic is being insulated or the ducts are being replaced anyway, doing the equipment at the same time avoids paying twice for access and setup.
The R-22 problem
If your system was installed before roughly 2010, there is a good chance it runs on R-22 refrigerant. Production and import of R-22 in the United States ended on January 1, 2020. It has not been illegal to service an existing system, but the only supply left is reclaimed and stockpiled, and the price reflects that.
The practical consequence is simple. On an R-22 system, a refrigerant leak stops being a routine repair and becomes an expensive one that will recur. Sealing a leak in a coil that has corroded in one place usually means the rest of that coil is not far behind.
If a technician quotes you a large number to recharge an older unit, ask which refrigerant it takes before you approve the work. That single question often settles the repair or replace decision on its own. The information is on the data plate of the outdoor unit, so you can check it yourself in about a minute.
What a proper diagnosis includes
You cannot make this decision on a guess, and neither can a contractor who has not measured anything. A real diagnostic visit should produce numbers, not adjectives.
Refrigerant pressures on both the suction and liquid sides, compared against the manufacturer specification for that model at that outdoor temperature.
Supply and return air temperatures, and the difference between them. A healthy system typically drops the air somewhere in the high teens to low twenties in degrees.
Amp draw on the compressor and both motors, compared against the rated load on the data plate.
Capacitor microfarad readings under load, not just a visual check for bulging.
A static pressure reading across the air handler, which is how duct restriction gets caught instead of guessed at.
The age, model, serial number, and refrigerant type of the equipment, written down.
Ask for those readings. A contractor who took them will hand them over without hesitation, and willingness to show the numbers is the clearest test of a contractor. If the answer is that the system is simply old and should be replaced, you have learned something about the contractor, not about the system.
What California requires when you replace
This is where Los Angeles differs from most of the country, and where a cheap quote should make you suspicious.
Most California jurisdictions require a permit for an air conditioner changeout. Beyond the permit, the state’s Title 24 energy code requires independent third party HERS verification on the work, typically covering refrigerant charge and duct leakage. That inspection exists to confirm the system was installed to perform the way it was sold to you.
A contractor who proposes skipping the permit leaves you with unpermitted work that surfaces during your next home sale, and no independent confirmation that the system you paid for is performing correctly. Verify any contractor’s license before work begins at cslb.ca.gov.
What a replacement involves
A straightforward changeout on a single family home is usually a one day job for a two person crew. Add a day if the ductwork is being replaced or the electrical service needs attention.
Before that day, a few things should have happened. The contractor should have performed a load calculation on your house before quoting a new system instead of copying the tonnage of whatever is sitting there now, because the existing unit may well have been the wrong size for the last fifteen years. They should have looked in the attic at the ducts and the return, since new equipment attached to restricted ductwork will disappoint you in exactly the same way the old equipment did. And the written proposal should name the equipment model numbers, the refrigerant, the warranty terms, the permit, and the HERS verification as line items, not as assumptions.
One change worth knowing about: federal rules that took effect in 2025 moved new residential equipment to lower global warming potential refrigerants, so new systems no longer ship with R-410A. That matters mainly because it limits mixing new outdoor units with older indoor coils. Ask your contractor to confirm what your proposed system uses and what that means for future service.
What you gain by replacing
Federal minimum efficiency standards for new split system air conditioners rose again in 2023, and California sits in the hot dry region carrying the higher of the two requirements. A system installed in the mid 2000s was built to a substantially lower standard than anything sold today, and many have lost efficiency on top of that.
Replacing genuinely old, declining equipment with a properly sized modern system typically produces a meaningful reduction in cooling costs. Be careful with any contractor who promises a specific percentage before performing a load calculation on your home. The honest answer depends on what you have now, how your ducts perform, and how your house is insulated.
The comfort difference is usually more noticeable than the bill. Variable speed and two stage equipment runs longer at lower output instead of blasting and shutting off, which evens out the temperature between rooms and makes the house quieter.
It is also worth checking current utility rebate programs through Southern California Edison or LADWP, and confirming whether federal tax credits currently apply to high efficiency heat pump equipment. These programs change, so confirm the terms in force at the time you buy rather than relying on last year’s figures.
If you are not ready to decide yet
Sometimes the honest answer is that the system has a season or two left and you would rather not spend now. That is a legitimate choice, and there are ways to protect it in the meantime.
Change the filter on schedule, every one to three months depending on the type, and more often during Santa Ana season. Clear two feet of space around the condenser and rinse the coil fins gently from the outside in. Keep the condensate drain clear. Raise the thermostat a few degrees during peak afternoon hours so the system is not fighting the hottest part of the day at full load. And get a tune up in spring rather than waiting for the first ninety degree week, when every contractor in the county is booked.
Those steps will not save a failing compressor. They will keep a tired system from failing earlier than it has to, and they give you the choice of replacing on your schedule instead of during an emergency.
Common questions
Is it worth repairing an air conditioner that is 15 years old?
It depends entirely on the repair. A capacitor or a contactor on a fifteen year old system that otherwise cools well is worth fixing. A compressor, a coil, or a significant refrigerant leak on that same system usually is not, because you would be investing a large sum in equipment near the end of its service life.
Can I replace just the outdoor unit and keep my old coil?
Usually not, and it is rarely a good idea even when it is technically possible. The outdoor unit and the indoor coil are engineered as a matched pair, and mismatching them costs you efficiency, can void the warranty, and often will not pass inspection. The 2025 refrigerant change has narrowed this further. Ask your contractor to confirm what is possible with your specific equipment.
How long does an air conditioner replacement take?
Most single family changeouts are completed in one day. Plan for longer if ductwork is being replaced, if the electrical panel needs work, or if access to the attic or the roof is difficult. Permit and HERS inspection scheduling happen after the install and do not keep the system from running.
Should I repair now and replace later?
That is often the right move when the repair is inexpensive and the timing is bad. Getting through the current season on a modest repair and replacing in the fall, when contractors have availability and you are not making the decision under pressure, is a reasonable plan. It stops being reasonable when the repair is large, because you end up paying twice for the same comfort.
Do I need a permit to replace my air conditioner in Los Angeles?
Yes, in most jurisdictions a changeout requires a permit, and California’s Title 24 code adds independent HERS verification of the completed work. A reputable contractor pulls the permit as part of the job and includes it in the written proposal.
Get a diagnosis before you get a quote
Any contractor recommending replacement should first tell you exactly what failed and why. If the conversation starts with a new system before anyone has diagnosed the old one, get a second opinion.
Cool Breeze LA technicians diagnose the root cause, explain the repair and replacement options in plain terms with written estimates, and tell you when a repair is the smarter spend. We serve Los Angeles, Calabasas, Sherman Oaks, Glendale, Pasadena and Burbank. Call (626) 548-3087 or book a diagnostic online.