How Much Does A Capacitor For An AC Unit Cost? Full Guide To AC Capacitor Pricing And Replacement

An AC unit’s capacitor is a critical component responsible for reliable cooling. If your air conditioner stops working, the capacitor could be the culprit—making its cost and replacement essential information for homeowners. This comprehensive guide explains AC capacitor prices, factors influencing replacement costs, when to change a capacitor, and how to choose the right one for your unit.

AC Capacitor Pricing Overview

Capacitor Type	Average Cost (Part Only)	Professional Replacement Cost	Common AC Unit Brands
Start Capacitor	$10 – $40	$100 – $250	Goodman, Trane, Carrier, Lennox
Run Capacitor	$8 – $45	$90 – $200	Rheem, Bryant, American Standard
Dual Run Capacitor	$15 – $60	$110 – $250	Most Central AC Units

What Is An AC Capacitor And Why Is It Important?

An AC capacitor stores and releases electrical energy, supporting the compressor and fan motors during start-up and operation. It ensures the unit powers up quickly and runs efficiently. If the capacitor fails, the air conditioner typically won’t cool, may not start, or could shut off randomly. The two main types are start capacitors and run capacitors.

Breakdown Of AC Capacitor Costs

Part Cost: Varies By Type And Brand

The average cost for a replacement AC capacitor (part only) is between $8 and $60. The price depends on the capacitor type (start, run, or dual run), capacitance rating, voltage requirements, and AC unit brand.

• Start Capacitors: $10–$40 each
• Run Capacitors: $8–$45 each
• Dual Run Capacitors: $15–$60 each

High-end brands or specialty units may command slightly higher prices. Bulk or online purchases often reduce costs.

Professional Replacement Cost: Labor Plus Parts

Hiring a professional HVAC technician normally costs between $90 and $250 in total per capacitor replacement. This price covers the part itself, labor, service fees, and a warranty for the work completed. Many reputable companies charge a fixed diagnostic/service call fee, generally ranging from $65 to $125, applied to the final bill if the repair is made.

Factors That Influence AC Capacitor Cost

Several factors drive how much you’ll pay for a new AC capacitor:

• Capacitor Type: Dual run capacitors are usually more expensive than single run or start capacitors.
• Unit Size & Brand: Larger capacitors, premium brands, and commercial units command higher prices.
• Voltage & Microfarad Ratings: Specialty specifications increase cost.
• Location & Emergency Service: Service calls after hours or in high-cost-of-living regions cost more.
• DIY vs. Professional Replacement: DIY costs less but requires electrical know-how and safety precautions.

When Should You Replace An AC Capacitor?

Capacitors typically last 5 to 10 years, but high usage, heat, or manufacturing defects can cause failure sooner. Signs that your AC capacitor needs replacement include:

1. AC hums but doesn’t start
2. The fan or compressor won’t run
3. Unit shuts off randomly
4. Burning smell or visible bulging/leakage from capacitor

Testing with a multimeter can confirm capacitor failure, but most homeowners rely on technician diagnostics.

Types Of AC Capacitors Explained

Start Capacitor

A start capacitor momentarily delivers a boost of power to help the compressor or fan motor kick on. Once the motor is running, the capacitor switches out of the circuit. Start capacitors have higher microfarad (µF) ratings and work only during start-up.

Run Capacitor

Run capacitors continuously assist the motor during operation, ensuring stable RPM and energy efficiency. They have lower µF ratings, operate for longer periods, and are necessary for the ongoing operation of the fan or compressor motor.

Dual Run Capacitor

Most modern central AC units use a dual run capacitor, combining two capacitors in one housing to support both the compressor and the fan motor. This dual setup simplifies maintenance and wiring.

Popular AC Capacitor Brands And Models

Brand	Typical Models	Notes
Packard	C130A, C140A	Widely used in residential AC units
Titan	PRO Run, Dual Run	Known for reliability and broad compatibility
GE	97F9834, 97F9835	OEM for many branded systems
Supco	CR5, CR10	Affordable, easy to find
Mars	10857, 12216	Heavy-duty and specialty capacitors

AC Capacitor Replacement: DIY Vs. Professional Repair

DIY Replacement

Replacing an AC capacitor is straightforward for those with electrical experience, familiarity with safety procedures, and the proper tools. Buying the part yourself online or from a local supplier helps save on labor costs. Expect to pay only for the part—usually $10 to $60.

DIY involves risks: always disconnect power at the breaker, discharge the old capacitor, and take photos of wire connections before removing. Failing to handle capacitors properly can result in electrical shocks or damage to the AC system.

Professional Replacement

Hiring an HVAC technician ensures safe installation, diagnosis of additional issues, and a warranty on parts and labor. The higher cost (typically $90 to $250 total) includes peace of mind and expertise. Professional service is recommended for those unfamiliar with electrical repairs or without specialized tools like capacitance testers.

How To Choose The Right Replacement AC Capacitor

• Match Microfarad Rating (µF): Get the exact µF value specified by your AC’s manufacturer.
• Check Voltage Rating: Most use either 370V or 440V ratings. Higher voltage-rated capacitors can replace lower, but not the reverse.
• Confirm Physical Size: Ensure the new capacitor fits in the mounting bracket.
• Terminal Type: Verify the new unit matches your wire connectors—most use quick-connect spade terminals.
• Brand Compatibility: OEM parts or high-quality aftermarket brands work best.

Buying from a reliable supplier and using your AC’s model information helps guarantee compatibility.

Step-by-Step Guide To Replacing An AC Capacitor

Professional advice: If you’re inexperienced, call an HVAC technician. For those comfortable with DIY, here’s the general process:

1. Turn off AC power at the main panel and at the outdoor disconnect box.
2. Open the condenser unit’s access panel (usually held by screws).
3. Locate the old capacitor—typically a metal canister with multiple wires.
4. Take clear photos of wire connections for reference.
5. Discharge the capacitor using an insulated screwdriver (bridge terminals for several seconds).
6. Disconnect wires and remove the old capacitor (loosen retaining bracket).
7. Install the new capacitor by reversing the steps, ensuring secure wire connections.
8. Reattach the access panel, restore power, and test the AC system for proper cooling.

Always wear safety gloves and eyewear during this repair.

Common AC Capacitor Problems And Warning Signs

• Bulging or Leaking: The metal canister may swell or ooze oily fluid.
• Burned Terminals: Charred or broken wires at the capacitor terminals suggest overheating.
• Weak Cooling: If your AC runs but barely cools, a failing run capacitor might be at fault.
• Frequent Cycling: A capacitor that’s near failure can make the compressor repeatedly turn on and off.
• Electrical Buzzing: Loud humming or clicking from the unit on startup may indicate capacitor issues.

How To Test An AC Capacitor

Testing a capacitor requires a digital multimeter that measures capacitance (µF). After safely removing and discharging the capacitor:

• Set the multimeter to capacitance mode
• Connect probes to the capacitor terminals as labeled (C, FAN, HERM)
• Compare the reading to the labeled µF value (within +/-6% is typically acceptable)

Capacitors with readings below the acceptable range should be replaced promptly.

AC Capacitor Replacement Cost By Location

Region	Typical Professional Cost
Northeast (NY, MA, NJ, PA)	$120–$250
Midwest (IL, OH, MO)	$90–$200
South (TX, FL, GA, NC)	$90–$170
West (CA, AZ, WA, OR)	$120–$250

Labor costs are generally higher in urban or high cost-of-living areas. Rural or smaller markets may offer lower rates due to reduced overhead.

Warranty And Insurance For AC Capacitors

Most capacitors have a manufacturer’s warranty of 1-5 years. Some HVAC companies include a limited parts warranty for installed components; always ask about coverage before scheduling service. Extended home warranties can sometimes include capacitor replacement as part of larger HVAC coverage, reducing or eliminating cost during the contract period.

Tips To Extend AC Capacitor Life

• Schedule Annual Maintenance: Routine professional inspections can spot early capacitor wear.
• Keep Outdoor Unit Clean: Remove debris and keep the condenser free of blockages.
• Monitor Voltage Fluctuations: Have an electrician check your supply if your home experiences frequent surges.
• Replace Air Filters Regularly: Good airflow reduces the risk of motor and capacitor stress.

Capacitors exposed to extreme heat, strain, or heavy duty cycles fail faster—routine care helps maximize lifespan.

Frequently Asked Questions About AC Capacitor Costs

Can You Replace A Capacitor With One Of A Higher Voltage?

Yes, you can use a capacitor rated for a higher voltage but not a lower one. Always match the microfarad (µF) rating exactly; using an incorrect capacitance can damage your AC.

Are Aftermarket Capacitors Safe To Use?

Aftermarket capacitors from reputable brands are generally safe and compatible, as long as their ratings match your original. Avoid unbranded or suspiciously cheap parts as they may have inferior performance or fail sooner.

How Often Do AC Capacitors Need To Be Changed?

Capacitors typically last between 5 and 10 years, but replacement may be needed sooner in hot climates or with heavy usage. Proactive replacement is suggested if the unit shows signs of capacitor fatigue, such as weak startups or random shutdowns.

Where To Buy AC Capacitors

• Local HVAC Supply Stores: AC contractors and DIYers can purchase direct replacement capacitors.
• Online Retailers (Amazon, eBay, Grainger): Wide selection of brands, often lower prices and fast shipping.
• Manufacturer Websites: Genuine OEM capacitors for specific unit brands.
• Home Improvement Stores (Home Depot, Lowe’s): Limited selection, but convenient for common ratings.

Have your AC’s make, model, and capacitor ratings (µF and voltage) on hand to ensure you order the correct part.

Summary: What To Expect For AC Capacitor Prices And Replacement

Expect to pay $8 to $60 for most residential AC capacitors if replacing the part yourself,
and $90 to $250 for full professional replacement including labor and warranty. Price depends on the type of capacitor, your AC’s specifications, and the cost of local service. Use only matching-rated capacitors and prioritize safety for all repairs.