AC capacitor replacement cost
This Old House puts AC capacitor replacement at $80–$400 in most cases, with an average of $175 for professional installation. The part itself is listed at $8–$45. Most of the bill is the service call and labor. It is one of the least expensive AC repairs, and on an otherwise healthy unit it is almost always worth doing.
Safety first. Do not replace a capacitor yourself. It can hold a dangerous electrical charge even after the power is switched off, and it sits inside the unit's electrical compartment.
AC capacitor cost by type
A capacitor stores a small charge that helps the compressor and fan motors start and keep running. Different motors use different capacitors. The table shows the part price and total price This Old House publishes for each type.
| Capacitor type | Part | Total with labor | Source |
|---|---|---|---|
| Run capacitor | $8–$30 | $98–$230 | This Old House |
| Blower capacitor | $9–$12 | $99–$212 | This Old House |
| Start capacitor | $9–$25 | $99–$225 | This Old House |
| Dual run capacitor | $15–$45 | $105–$245 | This Old House |
| Heat pump capacitor | $15–$25 | $105–$225 | This Old House |
Other publishers give similar overall ranges. A separate This Old House repair guide lists capacitor repair at $150–$400, and Fixr lists capacitor replacement at $100 to $400 with the part alone under $50.
Why a cheap part costs this much to replace
The capacitor is inexpensive. What you pay for is a licensed technician coming to your home, testing the system to confirm the capacitor is the fault, carrying the right part on the truck, and standing behind the repair.
This Old House lists labor at $60–$150 per hour and an average HVAC service call at about $129. The job itself is quick once the fault is confirmed. A good technician also checks why the capacitor failed, because a weak capacitor can be a symptom of a struggling motor or compressor.
What moves the price
- Capacitor type and rating. A dual run capacitor serves both the compressor and the fan and costs more than a single one.
- Brand-specific parts. Most capacitors are universal. A few units need a manufacturer part.
- Timing. Capacitors tend to fail in hot weather, when contractors are busiest. An evening or weekend visit adds an after-hours charge.
- How the company prices. A flat-rate company charges one price for the repair. An hourly company charges the service call plus time and the part.
- Related damage. If the contactor is pitted or a motor is failing, the technician may recommend replacing those too.
If you are not sure the capacitor is the problem, see the symptoms of a bad AC capacitor and how a technician tests it.
Repair or replace the AC
A failed capacitor on its own is never a reason to replace an air conditioner. This Old House says most capacitors last 10–20 years, and replacing one is routine maintenance over the life of a unit.
The picture changes if the capacitor keeps failing. Repeat failures point to another problem, such as a compressor drawing too much current, high voltage, or a unit that overheats because the outdoor coil is dirty. Ask the technician to check the amp draw on the compressor and fan motor before closing up.
What to check on the invoice
The invoice should name the capacitor type and its rating, list the part and labor or the flat-rate price, and show any service call fee and whether it was credited. Ask what warranty applies to the part and the labor, and ask for the old capacitor. For other repair prices, see the HVAC cost guides.
Common questions
How much does an AC capacitor cost by itself?
This Old House lists the capacitor part at $8–$45, depending on the type. The rest of a replacement bill is the service call and labor for a licensed technician to test the system and fit the part safely.
Can I replace an AC capacitor myself?
It is not a safe homeowner job. The capacitor sits in the high-voltage compartment of the outdoor unit and can hold a charge with the power off. A wrong rating or a wiring mistake can also damage the compressor.
How long does capacitor replacement take?
The swap itself is quick once the fault is confirmed. Most of the visit is testing. No sourced figure for the typical duration was found, so ask the contractor how long to allow.
How long do AC capacitors last?
This Old House says most capacitors last 10–20 years. Heat, power surges and a hard-working motor shorten that. If yours fail repeatedly, ask the technician to look for an underlying cause.
Related guides
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