Replacement · independent publisher, not a contractor
When should you replace an air conditioner?
Replace an air conditioner when a major part fails on an older system, when it uses R-22 refrigerant that is no longer produced, or when it no longer cools the house on hot days after a proper tune-up. Age alone is not a reason if it still works well.
Reviewed · 12 named sources · No named reviewer yet; see our editorial policy.
The honest answer: it is rarely just age
Search "when to replace AC" and you will see a number of years on nearly every page. Most of those numbers come from contractors, and they disagree. The federal sources we rely on do not publish an official lifespan, so we do not either.
What we can give you is a list of triggers that, together, make replacement the sensible call, and the 2026 rules that change what a replacement involves.
Key takeaways
In short
- Age alone is not a reason to replace a system that works.
- A leaking R-22 system, a failed compressor or a system that cannot keep up are.
- A 2026 replacement brings a permit, duct and refrigerant tests.
- Plan it for spring, not the first heat wave.
Signs it is time
| Sign | Why it matters | Weight |
|---|---|---|
| Compressor or coil failure on an older system | Those repairs are a large share of a new unit's price | Strong |
| R-22 refrigerant with a leak | Recharging relies on recovered and reclaimed stock | Strong |
| Cannot hold temperature in a heat wave after a tune-up | Undersized, failing or the house changed | Strong |
| Repairs in consecutive summers | The pattern tends to continue | Medium |
| Furnace also near its end | A heat pump can replace both | Medium |
| Bills creeping up with similar use | Efficiency loss, duct leaks or both | Check first |
| Noise, short cycling, clammy air | Could be size, charge or ducts | Diagnose first |
R-22: US EPA, "Phaseout of Class II Ozone-Depleting Substances" (HCFC-22 production and import ended 2020), retrieved 2026-10-18.
If your system uses R-22
Many Los Angeles systems installed before about 2010 run on R-22 (HCFC-22). US production and import ended in 2020 under EPA's phaseout (EPA), so any recharge comes from recovered and reclaimed stock.
What that means for you
An R-22 system that works and does not leak can keep running. An R-22 system with a refrigerant leak is the clearest replacement signal on this page: every recharge is buying time, not fixing anything.
Find the refrigerant on the outdoor unit's data plate. Ask the technician to note it on any repair quote.
What a new system changes
California is in DOE's Southwest region. A split AC installed since 1 January 2023 needs 14.3 SEER2 below 45,000 Btu/h (13.8 above), plus an EER2 minimum of 11.7 (11.2 for larger units; 9.8 at 15.2 SEER2 or more). Split heat pumps need 14.3 SEER2 and 7.5 HSPF2.
DOE says new energy-efficient heating or cooling equipment "alone can reduce energy use by 20% or more," and that combining it with insulation, air sealing and thermostat settings "can cut your heating and cooling bills by about 30%" (DOE Energy Saver Guide). Those are national figures for a typical house, not a promise for yours.
New equipment uses lower-GWP A2L refrigerants such as R-454B or R-32. An EPA rule effective 27 July 2026 lets installers keep fitting R-410A split systems built before 2025 until stock runs out. California sets its own HFC rules through CARB, so ask which refrigerant the quote uses and whether it can be installed here.
What 2026 rules add to a replacement
- A permit. The California Energy Commission says replacing or altering an HVAC unit needs a permit, the contractor seals and tests the ducts, and a third-party rater verifies the work, including duct leakage.
- Duct sealing and testing. Under Title 24 Part 6, replacing the condensing unit, air handler or coil is an alteration that triggers duct sealing. Adding more than 25 feet of new duct means the whole system must test at 10 percent leakage or less. Refrigerant charge checks apply to heat pumps everywhere and to ACs in zones 2 and 8–15.
- Third-party verification. From 1 January 2026 the CEC's Energy Code Compliance (ECC) program took over field verification from the HERS program, so the third-party rater on a 2026 change-out works under ECC.
- No federal credit. The federal 25C credit applied to qualifying equipment placed in service before 31 December 2025. A system installed in 2026 does not qualify.
That testing is part of the cost of replacement, and one reason a like-for-like swap is not just a swap. See the permit guide.
What replacement costs in Los Angeles
Affordable Heating and Air prints a full-system replacement at $9,000–$22,000, with most jobs at $11,000–$13,000. Common adders: duct repair ($800–$4,500), a panel upgrade ($2,000–$7,500) and the permit ($250–$800).
Every source and date on the cost guide.
Timing in Los Angeles
Valley stations average many more 90 °F days than the coast: Woodland Hills 115.3, Burbank 53.9, LAX 4.8 on NOAA normals.
Replace before the heat, not during it
In the Valley, a system that limped through last summer is a reason to get quotes in spring, when contractors have time to run a load calculation and you have time to compare. A July breakdown is when people accept the first price they hear.
A replacement plan in five steps
- Read the data plate. Model, year if shown, refrigerant.
- Get a repair quote and a replacement quote on the same visit.
- Compare them with repair vs replacement.
- Price a heat pump too if the furnace is old: central AC vs heat pump.
- Line up two or three replacement quotes in the quote tool.
Replace the AC and furnace together?
If the furnace is also old, replacing both at once means one permit, one set of tests and matched indoor and outdoor equipment. It is also the moment a heat pump makes the most sense, because one outdoor unit can do both jobs.
| Option | What you get | Published LA range |
|---|---|---|
| New AC, keep furnace | Cooling replaced | $8,000–$16,000 (3 ton) |
| Heat pump, retire furnace | Cooling and heating replaced | $12,000–$15,000 (3 ton, one source) |
Compare them in central AC vs heat pump.
The cost of waiting
Breakdowns pick their moment
Systems tend to fail when they work hardest, which in the Valley means July and August, when contractors are busiest and a broken AC leaves you with one quote and no time. Planning a replacement for spring is the cheapest insurance against that.
Sources
- 10 CFR 430.32(c), Electronic Code of Federal Regulations (retrieved 2026-09-29)
- NAHB summary of the EPA final rule under the AIM Act (May 2026); California rules per CARB (verify) (retrieved 2026-09-29) — verify before relying on it
- California Energy Commission, "Building Energy Efficiency Resources for Single Family Homes" (retrieved 2026-09-29)
- Energy Code Ace (CEC-supported), Single-Family Compliance Manual ch. 9, § 150.2(b)1E–F, 2022 code text; confirm against the 2025 code in force since 1 January 2026 (retrieved 2026-09-29) — verify before relying on it
- California Energy Commission, "Home Energy Rating System (HERS) Program" (retrieved 2026-09-29)
- IRS, "Energy Efficient Home Improvement Credit" (retrieved 2026-09-29)
- NOAA NCEI, U.S. Climate Normals 1991–2020, annual/seasonal (stations USW00023174, USW00093134, USW00023152, USC00049785) (retrieved 2026-09-29)
- US EPA, "Phaseout of Class II Ozone-Depleting Substances" (HCFC-22 production and import ended 2020) (retrieved 2026-10-18)
- US Department of Energy, "Energy Saver Guide: Tips on Saving Money and Energy at Home" (2022) (retrieved 2026-10-18)
- Reliable Heating and Air (Woodland Hills), AC installation cost in LA and Ventura County (retrieved 2026-09-29)
- Cold Cloud (Glendale), central air cost in Los Angeles (retrieved 2026-09-29)
- Affordable Heating and Air (Chatsworth), AC replacement cost in Los Angeles (retrieved 2026-09-29)
Questions
How long does an air conditioner last?
Contractor sites commonly quote somewhere between 10 and 20 years, but the federal sources we use publish no official lifespan. Maintenance, installation quality and how hard the summers are matter more than the calendar.
Should I replace a working 15-year-old AC?
Not just for age. If it cools the house, does not leak and repairs have been minor, it can keep running. Plan for replacement so you are not forced into it during a heat wave.
Is R-22 still available?
US production and import of R-22 ended in 2020 under EPA's phaseout. Service relies on recovered and reclaimed refrigerant, which is why a leaking R-22 system is a strong replacement signal.
Do I have to replace the indoor coil too?
Usually. The outdoor unit and indoor coil are rated as a matched system for SEER2 and EER2, and a refrigerant change needs compatible components. Ask the contractor to state matched model numbers.
Will a new AC lower my electric bill?
It can. DOE says new efficient equipment alone can reduce energy use by 20% or more nationally. Your result depends on how old and leaky your current system and ducts are.
What is the best time of year to replace an AC in LA?
Spring or fall, before or after the Valley heat. Contractors have more time to quote properly and you have time to compare quotes and check rebates.
Does replacing an AC need a permit in Los Angeles?
Yes. The California Energy Commission says a permit is required when an HVAC unit is replaced or altered, and the permit brings duct and refrigerant tests.
Can I replace just the outdoor unit?
Sometimes, if the indoor coil is compatible and in good shape, but mismatched pairs may not reach the rated efficiency. Ask the contractor to confirm the matched rating in writing.
Next step
Free quote request
Get a quote to check against these numbers
- Tell us about the job. Service, ZIP, property and timing. The form says right away if your ZIP is outside the area.
- We check the license first. Requests go only to contractors whose CSLB C-20 license we have matched on the state register. If none covers your ZIP yet, we email you and say so.
- Compare what comes back. Line the written quote up against the published ranges and the quote checklist.
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