Your AC is acting up, and now you have a choice to make. Fix it, or buy a new one? It’s a question we hear a lot, and the answer isn’t the same for every house. But a few things point you in the right direction. How old the unit is, what the repair costs, and how often it breaks are the big ones.
This post is written for homes in Los Angeles and the valleys around it. We’ll go over the warning signs, what things usually cost, and why refrigerant matters more than people think. There are also two quick rules of thumb that HVAC techs use all the time.
Short answer: Under 10 years old with a small problem? Repair it. Over 12 years old with a big bill, or a unit that keeps breaking? Replacing it usually costs less in the long run.
Why This Choice Is Harder in Los Angeles
ACs here work hard. In the San Fernando Valley, summer days often go past 100°F, and a lot of systems run from May to October without much of a break. That adds up. A 12 year old unit in LA has probably seen more hours than the same unit in a cooler place.
Prices matter too. Labor and equipment cost more in Southern California than in many other areas, so a big repair stings and a new install does too. Getting real numbers first is worth the time. Paying to fix a healthy system is fine. Paying to fix one that’s already on its last legs, not so much.
Signs Your AC Can Still Be Repaired
If most of these sound like your system, a repair is probably the way to go.
- The unit is less than 10 years old
- The problem is one part, like a capacitor, contactor, fan motor, or thermostat
- It cooled fine until this problem showed up
- You’ve had a tune-up in the last year or so
- The parts are still under warranty (many run 5 to 10 years, but only if the unit was registered)
- Your electric bill hasn’t jumped
Weak airflow is a good example. People assume the AC is dead, but it’s often just a clogged filter or a dirty coil. We wrote about the usual causes in our post on why your AC is barely blowing air.
Signs It May Be Time to Replace Your AC
Other problems tell you the system is just worn out.
- The unit is 12 to 15 years old, or older
- You’ve paid for two or more repairs in the last two years
- The compressor died
- It uses R-22 refrigerant and it’s leaking
- Your electric bill keeps going up, even though you use the AC the same as before
- Some rooms are hot and others are cold
- You hear grinding, banging, or loud squealing
- Ice keeps forming on the coil, or you see rust on the unit
Heads up: One sign on its own doesn't mean much. If you check off three or four, that's when to start thinking about a new system.
How Long Does an AC Last?
Most central air conditioners last 15 to 20 years. In hot areas where the AC runs most of the year, 10 to 15 years is more normal. Here’s a rough guide.
| AC Age | Where It Stands | Usual Choice |
|---|---|---|
| 0 to 7 years | Still in good shape | Repair |
| 8 to 10 years | Middle of its life | Repair if the cost is low |
| 11 to 14 years | Getting close to the end | Compare both options |
| 15 years or more | Past its best years | Replace in most cases |
It’s only a guide. A 14 year old unit that got regular service can outlast a 9 year old one that nobody ever checked.
Two Rules Techs Use: The 5,000 Rule and the 50 Percent Rule
The 5,000 rule is easy math. Take the age of your AC and multiply it by the repair cost. If you get more than 5,000, replacing is probably the better deal. Say your AC is 12 and the repair is $500. That’s 6,000, so replace. If the AC is 6 and the repair is $400, you get 2,400. Just fix it.
The 50 percent rule is even shorter. If the repair costs more than half of what a new system would, replace it. Neither rule is perfect, to be honest. They don’t look at your energy bills or how long you plan to live in the house. Use them as a quick gut check before you talk to a contractor.
Good to know: Don't lean on just one rule. Look at it together with what the technician finds and what you can spend.
AC Repair Cost vs AC Replacement Cost in Los Angeles
Prices change with the size of your home, the brand, and the shape your ducts are in. So these are ballpark numbers only. Get everything in writing.
| Job | Typical Cost |
|---|---|
| Capacitor or contactor | $150 to $450 |
| Fan motor | $400 to $900 |
| Refrigerant leak repair and recharge | $300 to $1,500 |
| Compressor replacement | $1,500 to $3,000 |
| Full central AC replacement | $6,000 to $15,000 |
See the compressor line? Once a repair gets close to a third or half of a new system, it gets harder to justify. On an older unit, that money is usually better put toward a new one.
Refrigerant: R-22, R-410A, and What Comes Next
Older systems run on R-22, which people also call Freon. It was phased out in the U.S. in 2020, so what’s left is limited and pricey. A recharge can cost a few hundred dollars, and if the leak is still there, you’ll pay again next summer. If your R-22 system is leaking, replacing it is usually the smarter move.
Most systems from the last 15 years or so use R-410A. New systems made since 2025 use newer refrigerants like R-454B or R-32, which are easier on the climate. R-410A is still around for servicing existing units, but supply may get tighter over time. And you can’t just pour the new stuff into an old system. It doesn’t work that way. So ask your tech which one your unit uses.
Energy Bills, SEER2, and Rebates
ACs get less efficient as they age. Parts wear down, and the system needs more power to do the same job. A lot of units from the early 2000s were rated around SEER 8 to 10. In California, new split system air conditioners under 45,000 BTU have to meet at least 14.3 SEER2. How much you’d save depends on your old unit, your home, and how often you run it.
Utility programs from LADWP or Southern California Edison sometimes give rebates on high efficiency equipment. They change a lot, so check what’s open before you buy. If you plan to stay in the house five years or more, a new unit can pay you back through lower bills. If you’re selling soon, a repair might be enough.
What Replacement Involves in California
A new install is more than swapping one box for another.
- A permit is usually needed
- California energy rules (Title 24) often call for duct leakage testing and a refrigerant charge check
- The unit should be sized for your home, because one that’s too big or too small wears out early
- Old or leaky ducts may need work, and air duct replacement can sometimes be done in the same visit
- Most installs take one to two days
- Ask about the warranty on parts and on labor
If you’re comparing models, the new AC systems page shows what’s available. Some people also ask about heat pumps at this point, since one unit can cool and heat.
Questions to Ask Before You Decide
A good tech won’t mind any of these.
- What exactly is wrong with my system?
- Is this a one time thing, or will more problems follow?
- What refrigerant does my AC use?
- How much to repair it, and how much to replace it?
- Is my current unit the right size for the house?
- Are there any rebates or warranty coverage I can use?
Ask for both quotes in writing so you can compare them at home, not on the spot. An AC system diagnostic can also help find the real cause first. And if you do repair, a yearly summer maintenance visit helps catch the next problem early.
Tip: If the number feels too high, get a second opinion. Waiting a day or two is fine if you have a fan or two. But if it's a full breakdown in a heat wave, emergency HVAC service is the faster route.
What Makes Sense for Your Home and Your Wallet
If the AC is fairly new and the problem is small, repair it. If it’s old, loud, and keeps breaking, replacing it is usually the better call. The in-between cases come down to three things: age, repair cost, and how long you’ll stay in the home.
Try this. Write down how old your unit is and add up what you’ve spent on repairs lately. Then compare that to a quote for a new system. If the repairs are getting close to half the price of new equipment, that tells you a lot. Get two written prices and go from there.
Want a straight answer on your own AC?
AOL Heating & Air offers free on-site estimates in Los Angeles County. A technician will look at your system, tell you what is wrong, and give you repair and replacement prices. Call 818-705-0000 or request a quote.
