How Much Does an AC Capacitor Replacement Cost?
An AC capacitor costs $80 to $400 to replace, about $175 on average. The part is only $8 to $45 — the rest is the service call and labor.
Replacing an AC capacitor costs $80 to $400, and most homeowners pay about $175 (This Old House; Bob Vila puts the range at $60 to $300). The capacitor itself is only $8 to $45 — almost all of the cost is the service call and the technician's time.
This is the single most common air conditioner repair, and one of the cheapest. It is worth doing promptly on an AC of any age, because a failing capacitor makes the fan motor and compressor work harder every time the unit starts.
How much does it cost to replace an AC capacitor?
$80 to $400 installed, around $175 on average. What kind of capacitor your unit uses barely moves the total — the labor is the same either way:
| Capacitor type | What it does | Installed cost (2026) |
|---|---|---|
| Run capacitor | Keeps the fan or compressor motor turning — the common single AC capacitor | $98–$230 |
| Start capacitor | Gives a struggling motor an extra push to spin up | $99–$225 |
| Dual-run capacitor | One can that serves both the condenser fan and the compressor | $105–$245 |
| Heat-pump capacitor | Same job, but the unit runs year-round so it wears faster | $105–$225 |
| Blower (furnace) capacitor | Runs the indoor blower motor | $99–$212 |
Source: This Old House, 2026.
Why does a $15 part cost $175 to replace?
You are paying for the visit, not the component. A diagnostic or service call is around $129 on its own (This Old House). On top of that, HVAC labor runs $60 to $150 an hour with a minimum charge, and a technician who does the job right also tests the fan motor and compressor that the weak capacitor was straining — a failed capacitor is often a symptom, not just a part. The capacitor is the smallest line on the invoice.
Can I replace an AC capacitor myself?
Physically it is a five-minute swap — but a capacitor holds a live charge even after you cut the power, and discharging it incorrectly can give you a serious shock. Manufacturers like Bryant treat it as a technician's job for that reason.
If you know how to safely discharge a capacitor and you match the microfarad (µF) rating and the voltage exactly to the old one, the part is $8 to $45 at any HVAC supply house. If any part of that is unfamiliar, the $80 to $200 for a professional is the right call — a wrong µF value burns out the motor it was supposed to protect.
How do I know the capacitor is the problem?
The tells, roughly in order of how common they are:
- The outdoor unit hums but the fan doesn't spin — or you can start it spinning with a stick and then it runs (a classic bad-capacitor test, and a reason to call for service, not a fix).
- The AC clicks or struggles to start, runs for a few minutes, then shuts off.
- The air coming out is warm even though the outdoor fan seems to be running.
- Higher-than-usual electric bills as the motors draw extra current fighting a weak capacitor.
- The capacitor itself has a bulging or domed top, or oily residue around its base. A swollen top means it is done.
How long does an AC capacitor last?
About 10 to 20 years (This Old House), but heat shortens that sharply. A capacitor on a rooftop unit, a south-facing condenser in Phoenix or Houston, or a heat pump that also runs all winter often fails at 5 to 10 years. Power surges and an AC that short-cycles on a hot day both take a toll too.
Does a bad capacitor damage anything else?
Yes — that is why it is worth fixing quickly. When a capacitor weakens, the fan motor and the compressor draw extra current every time they try to start. Left alone for a season, a $175 capacitor job can turn into a $1,000-plus compressor replacement or a burned-out fan motor.
Age changes how much to spend on any of this. Check your AC's build year, and if it is past 15, read how long an AC lasts before you put money into anything bigger than the capacitor.
Frequently Asked Questions
How much does it cost to replace an AC capacitor?
$80 to $400, and about $175 on average (This Old House; Bob Vila puts it at $60 to $300). The capacitor itself is only $8 to $45 — the rest is the service call, the diagnosis, and a labor minimum.
Why is it $175 to replace a $15 part?
Because you are paying for the visit, not the component. A diagnostic or service call runs around $129 on its own, the technician has a labor minimum whether the job takes 20 minutes or an hour, and a proper repair includes testing the motor and compressor the failed capacitor was straining.
Can I replace an AC capacitor myself?
It is a cheap part and a simple swap, but a capacitor stores a live electrical charge even with the power off, and discharging it wrong can hurt you. If you know how to safely discharge it and match the microfarad (µF) and voltage rating exactly, the part is $8 to $45. If any of that is unfamiliar, pay the $80 to $200 for a pro.
How long does an AC capacitor last?
About 10 to 20 years (This Old House), but heat is hard on them — a capacitor on a rooftop or south-facing unit in a hot climate, or on a heat pump that runs year-round, often fails closer to 5 to 10 years.
What are the signs of a bad AC capacitor?
The outdoor unit hums but the fan does not spin, or spins slowly; the AC struggles to start, clicks, or shuts off on its own; the air is warm; or the capacitor itself has a bulging, domed top or leaked oil. A swollen top is a definitive sign.
Sources
- This Old House — How Much Does AC Capacitor Replacement Cost? (2026) — total $80–$400 (average $175); part $8–$45; labor $60–$150/hr, $90–$200 total; service call ~$129; installed cost by type — run $98–$230, start $99–$225, dual-run $105–$245, heat-pump $105–$225, blower $99–$212; capacitor lifespan 10–20 years
- Bob Vila — How Much Does an AC Capacitor Cost to Replace? — total $60–$300, average ~$170; the part is cheap, most of the cost is diagnosis, labor, service fee and post-repair testing; a bulging or domed top is a definitive sign of failure
- Bryant — AC Capacitor Replacement Guide: Signs, Costs & Repair Steps — manufacturer guide: what a run vs start vs dual-run capacitor does; symptoms (humming, hard starting, warm air, unit shutting off); a stored charge remains after power-off — treat replacement as a job for a technician