How much does it cost to replace an AC capacitor?
Replacing an AC capacitor costs $250 to $400 including labor according to HomeGuide, and Angi puts the same job at $200 to $400.
Two guides, one answer, which is rarer on this board than it ought to be. HomeGuide's national average is $300 with a floor of $150 and a ceiling of $500. Angi's average is $250. The agreement matters because it means a quote well outside that band is worth a second look rather than a shrug.
This page is general information, not professional advice. Prices move with your equipment, your region and the season, and the only number that counts is a written quote from a licensed HVAC contractor who has looked at your system.
AC capacitor price: the part is almost nothing
Here is the number that surprises people. HomeGuide prices the capacitor itself at $15 to $80. Angi says the capacitor rarely exceeds $45 and breaks it down further: a run capacitor at $8 to $30, a dual-run at $15 to $45, a start capacitor at $9 to $25, a blower capacitor at $9 to $12.
So the part is a rounding error and everything else on the invoice is the technician. That is not a scam, it is what a trade call costs — but knowing the split is what lets you ask the right question about the rest of it.
| Line | HomeGuide | Angi |
|---|---|---|
| The capacitor itself | $15 – $80 | Rarely over $45 |
| Labor rate | $75 – $150 per hour | $200 – $400 for the job |
| Finished job | $250 – $400 | $200 – $400 |
| Flat-rate pricing | Not published | $300 – $600 all in |
Cost of replacing a capacitor on an air conditioner: how long it takes
About an hour. HomeGuide says replacing an HVAC capacitor takes roughly that, and may take longer if the technician does not already have the right part on the truck. That hour is why a $250 bill for an $18 component is not automatically unreasonable — you are paying for someone to arrive, diagnose it and carry the stock.
Source: HomeGuide
Angi adds the flat-rate wrinkle. Many companies charge one all-inclusive price for a capacitor replacement, often $300 to $600, which includes the part. It also says an emergency, weekend or holiday call adds a fee on top.
Source: Angi
HVAC capacitor replacement: what the part actually does
It stores and releases the jolt of energy the motors need to start and keep running. HomeGuide explains that an air conditioner needs more energy to start up than the home's electrical system can supply on its own, so the start capacitor covers the gap and the run capacitor keeps the motor turning after it starts. A dual-run capacitor does both jobs in one can.
Source: HomeGuide
It sits inside the outdoor condenser unit, near the compressor or the fan motor. HomeGuide says a capacitor tends to last 8 to 15 years and Angi says 10 to 20, with power surges and extreme temperatures shortening that.
Why a cheap part is worth fixing quickly
Because of what it drags down with it. HomeGuide says that while an air conditioner may keep running with a bad capacitor, doing so can seriously damage the compressor, the fan motor and other parts that cost far more to replace — and can cause complete system failure. A $250 job protects a $2,300 one.
- The unit stutters when it tries to start, or hums and does not start at all.
- It shuts off on its own, at random, with the thermostat still calling for cooling.
- Warm air comes out of the vents while the outdoor fan is turning.
- There is a clicking or humming sound from the outdoor unit.
Those signs are also symptoms of several other faults, which is exactly why the diagnostic is part of the bill. A technician who replaces the capacitor without checking anything else has guessed, and you paid for a guess.
If the capacitor turns out not to be the problem, the compressor is the expensive alternative: what an AC compressor replacement costs.
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Questions people ask next
- How much is an AC capacitor at a parts store?
- HomeGuide prices the part alone at $15 to $80 depending on the type, and Angi says the capacitor itself rarely exceeds $45. The difference between that and the invoice is the diagnosis, the labor and the trip.
- Can I replace an AC capacitor myself?
- Angi says a do-it-yourself replacement runs $60 to $100 including the tools, saving $200 to $400 in labor, and in the same breath warns that capacitor replacement carries a risk of electric shock and should only be attempted with the knowledge and protective gear to do it safely.
- How long does an AC capacitor last?
- HomeGuide says 8 to 15 years on average and Angi says 10 to 20. Both note that frequent power surges and extreme temperatures shorten it, which is why the same part fails sooner in a hot climate.
- Will an AC run with a bad capacitor?
- It might, and HomeGuide says that is the danger — running with a failed capacitor can seriously damage the compressor and fan motor, which are far more costly to replace, and can cause complete system failure.
Written for homeowners by Most Recommended HVAC, which measures which HVAC companies AI assistants actually recommend in 26 U.S. metros. Nobody can pay to be on those lists. How we measure.