When a central air conditioner stops cooling during summer, the repair cost can range from a relatively inexpensive electrical fix to several thousand dollars for a major component replacement.
In the United States, common central AC repairs generally cost between $171 and $662, although basic service may cost closer to $100 and major repairs can reach $3,000 or more. Capacitors, contactors, thermostats, and clogged drain lines are usually among the least expensive problems. Compressors, evaporator coils, condenser coils, and refrigerant leaks tend to cost significantly more.
The final price depends on the failed component, AC size, refrigerant type, system age, warranty coverage, accessibility, local labor rates, and whether the repair is performed during regular hours or as an emergency.
Central AC Repair Cost at a Glance
| Common AC problem | Typical repair cost |
|---|---|
| Diagnostic or service call | $75–$250 |
| Clogged condensate drain line | $75–$200 |
| AC contactor replacement | $115–$320 |
| Capacitor replacement | $120–$475 |
| Thermostat replacement | $60–$440 |
| Fuse, breaker, or relay | $15–$300 |
| Circuit board replacement | $150–$700 |
| Condenser fan motor | $100–$700 |
| Blower motor replacement | $300–$900 |
| Refrigerant recharge | $200–$500 |
| Refrigerant leak repair | $250–$1,600 |
| Evaporator coil replacement | $600–$2,000 |
| Condenser coil replacement | $800–$3,000 |
| Compressor replacement | $800–$2,300 |
| Drain pan replacement | $200–$600 |
| Ductwork repair | $500–$2,000 |
These are national estimates rather than guaranteed quotes. Prices may be higher during a heat wave, for after-hours service, or when the technician must obtain proprietary parts.
Average Central AC Repair Cost
A typical central AC repair costs approximately $100 to $500, but the broader range for common air-conditioning repairs is around $171 to $662. Major component failures can increase the total to $2,000 or $3,000.
Most HVAC companies begin with a diagnostic appointment. The initial service call generally costs $75 to $250 and covers the technician’s travel, inspection, and identification of the problem.
After diagnosis, the contractor may charge:
- A flat price that includes parts and labor
- An hourly labor rate plus materials
- A minimum service charge
- An emergency or after-hours surcharge
HVAC labor commonly costs $100 to $250 per hour, although rates vary by region and company. Labor can represent as much as half of the total repair price.
Ask whether the diagnostic fee will be credited toward the repair if you authorize the work.
Central AC Repair Cost by Common Problem
AC capacitor replacement
Replacing an AC capacitor typically costs $120 to $475, with many current estimates near $200 to $400.
The capacitor stores electrical energy and helps start the compressor and fan motors. A failed capacitor may cause the outdoor unit to hum, start slowly, cycle repeatedly, or fail to turn on.
Capacitors are relatively inexpensive parts, but professional installation includes diagnosis, labor, safe electrical discharge, and system testing. An experienced technician can often complete the replacement in less than an hour.
AC contactor replacement
An AC contactor replacement generally costs $115 to $320 when the part is not covered by warranty. Homeowners with warranty coverage may pay approximately $100 to $250 for labor and service charges.
The contactor is an electrical switch that sends power to the compressor and outdoor fan. Signs of failure include buzzing, chattering, visible corrosion, or an outdoor unit that will not start.
Thermostat replacement
Replacing an AC thermostat costs approximately $60 to $440, including parts and labor. A standard programmable model is usually less expensive than a smart thermostat that requires additional wiring or system configuration.
Before replacing the thermostat, check the batteries, temperature setting, cooling mode, and circuit breaker. A thermostat problem can resemble a larger AC failure even when the cooling equipment itself is working properly.
Clogged condensate drain line
Cleaning a clogged AC drain line typically costs $75 to $200.
During normal operation, the evaporator coil removes moisture from indoor air. That water flows into a drain pan and exits through the condensate line. Algae, dust, sludge, or debris can block the pipe.
Warning signs include:
- Water around the indoor unit
- A full drain pan
- Musty odors
- Increased indoor humidity
- AC shutting down because of a float switch
- Water stains on walls or ceilings
A blocked condensate drain can cause property damage if water overflows into the surrounding area. ENERGY STAR recommends inspecting the drain as part of professional HVAC maintenance.
Refrigerant recharge
A residential AC recharge generally costs $200 to $500, with an average near $300. The total depends on the refrigerant type, system capacity, amount needed, and labor required.
Refrigerant does not normally disappear during operation. If the level is low, the system probably has a leak that should be located and repaired before or during the recharge.
Signs of low refrigerant include warm air, ice on the refrigerant lines, long cooling cycles, hissing sounds, and rising electricity bills.
Only technicians with the appropriate EPA Section 608 certification may service equipment in a way that could release regulated refrigerant. Homeowners should not attempt to open or recharge a central AC refrigerant circuit themselves.
Refrigerant leak repair
Repairing a central AC refrigerant leak typically costs $250 to $1,600, with an average near $800.
The leak’s location makes a major difference:
| Refrigerant-related repair | Typical cost |
|---|---|
| Leak detection | $100–$450 |
| Seal or valve replacement | $150–$500 |
| Refrigerant line repair | $200–$1,500 |
| Evaporator coil repair or replacement | $600–$2,000 |
| Condenser coil repair or replacement | $900–$2,400 |
| Refrigerant recharge after repair | $150–$500 |
A small leak at an accessible valve may be relatively affordable. A leak inside an evaporator or condenser coil often requires replacement of the complete coil.
Older systems that use R-22 can be especially expensive to recharge because available supplies are limited. If an aging R-22 system has a major leak, replacement may provide better long-term value than repeatedly adding refrigerant.
Evaporator coil replacement
Replacing an evaporator coil generally costs $600 to $2,000, with an average near $1,000.
The evaporator coil is located inside the indoor air handler or above the furnace. Refrigerant flowing through the coil absorbs heat from indoor air.
Replacement is labor-intensive because the technician must recover the refrigerant, disconnect the old coil, install the new component, reconnect and seal the refrigerant lines, evacuate the system, and recharge it.
A dirty filter or restricted airflow can cause the coil to freeze, but a frozen coil does not automatically mean it must be replaced. The technician should first determine whether the cause is dirt, low airflow, a blower problem, or low refrigerant.
Condenser fan motor replacement
Replacing the outdoor condenser fan motor typically costs $100 to $700, with an average near $500. The price may rise to $1,200 for certain motors, premium brands, or out-of-warranty systems.
The fan moves air across the condenser coil and helps release heat outdoors. A failed motor can cause the compressor to overheat.
Common warning signs include:
- Fan blade does not spin
- Outdoor unit hums
- Fan starts only when pushed
- Grinding or rattling noises
- Compressor shuts down from overheating
- AC blows warm air
Turn the system off if the outdoor fan is not operating. Continuing to run it can damage the compressor.
Blower motor replacement
A central AC blower motor replacement generally costs $300 to $900.
The blower pushes cooled air through the ducts. If it fails, the outdoor unit may run while little or no air comes from the vents.
Before replacing the motor, the technician may inspect the capacitor, control board, belt, wiring, filter, and blower wheel. Some airflow problems come from a less expensive component or a severely clogged filter.
Circuit board replacement
Replacing an AC control board usually costs $150 to $700.
The circuit board coordinates system operation and communicates with thermostats, motors, sensors, and safety controls. Electrical surges, moisture, age, and damaged wiring can cause failure.
Because several unrelated problems can produce similar symptoms, the board should be tested before replacement. If the part is covered under warranty, the homeowner may pay only $100 to $300 in labor.
Compressor replacement
Replacing a central AC compressor typically costs $800 to $2,300, with an average near $1,200. Some compressor projects can approach $3,000.
The compressor circulates refrigerant between the indoor and outdoor coils. It is one of the system’s most important and expensive components.
Possible symptoms include:
- Warm air from the vents
- Loud noises from the outdoor unit
- Frequent circuit-breaker trips
- Short cycling
- Weak cooling
- Outdoor unit will not start
A failed compressor does not always make replacement of the entire AC mandatory. However, full system replacement may be more economical when the unit is old, inefficient, out of warranty, or requires other expensive repairs.
Condenser coil replacement
Replacing a damaged condenser coil usually costs $800 to $3,000.
The condenser coil surrounds part of the outdoor unit and releases heat absorbed from the home. Corrosion, impact damage, refrigerant leaks, and poor maintenance can cause failure.
Because coil replacement can cost a substantial percentage of a new outdoor unit, compare both options before approving the repair.
Drain pan replacement
Replacing an AC drain pan generally costs $200 to $600, although difficult installations may cost more.
A cracked or rusted drain pan allows condensation to leak beneath the indoor unit. This can damage ceilings, insulation, flooring, or the air handler platform.
The repair is more expensive when the evaporator coil must be lifted or removed to reach the pan.
Factors That Affect Central AC Repair Cost
System age and condition
Older equipment may require discontinued or difficult-to-find parts. It may also develop several related problems rather than one isolated failure.
AC size and brand
Larger systems use higher-capacity motors, compressors, coils, and refrigerant charges. Original equipment manufacturer parts may cost more than compatible aftermarket components.
Warranty coverage
A manufacturer’s warranty may cover the replacement part but not diagnosis, refrigerant, shipping, or installation labor. Ask the contractor to verify coverage before ordering an expensive component.
Repair timing
HVAC companies are busiest during heat waves. Emergency, evening, weekend, and holiday service usually costs more than a scheduled weekday appointment.
Accessibility
Attic air handlers, rooftop systems, tight crawl spaces, and equipment surrounded by landscaping require additional labor.
Repair or Replace the Central AC?
Repair is generally reasonable when:
- The system is less than 10 years old
- The repair is a one-time problem
- The unit is still under warranty
- The repair costs far less than replacement
- The system has been reliable and efficient
- Compatible parts are readily available
Replacement may provide better value when:
- The system is 10 to 15 years old or older
- Repairs have become frequent
- The unit uses expensive R-22 refrigerant
- The compressor or both coils are failing
- Energy bills have increased substantially
- The system cannot cool the home evenly
- The repair exceeds approximately 50% of replacement cost
Current national estimates place complete central AC replacement at roughly $3,800 to $7,500, depending on equipment size, efficiency, labor, and installation requirements.
Request written prices for both repair and replacement before investing several thousand dollars in an older system.
How to Reduce AC Repair Costs
- Replace the filter regularly. ENERGY STAR recommends checking it monthly and changing it when dirty.
- Keep the outdoor unit clear. Remove leaves, grass, and vegetation that restrict airflow.
- Schedule preventive maintenance. A technician can inspect refrigerant levels, coils, controls, drains, and blower components.
- Address unusual symptoms early. Grinding, ice buildup, water leaks, and repeated short cycling can lead to larger failures.
- Check warranty coverage. Major parts may still be protected.
- Compare written estimates. For expensive repairs, obtain more than one diagnosis.
- Avoid unnecessary emergency calls. Schedule regular service when the situation can safely wait.
- Do not repeatedly recharge a leaking system. Repairing the source prevents wasted refrigerant and recurring expense.
Dirty filters, coils, and blower components reduce airflow and can increase energy use or shorten equipment life.
Frequently Asked Questions
How much does central AC repair cost?
Common repairs generally cost $171 to $662, although minor service may cost around $100 and major compressor or coil work can exceed $2,000.
What is the most expensive AC part to replace?
The compressor and coils are usually among the most expensive components. Compressor replacement costs $800 to $2,300, while condenser coils can cost $800 to $3,000.
How much does an AC service call cost?
An HVAC diagnostic or service call typically costs $75 to $250. Ask whether that amount is credited toward the approved repair.
Why is my AC running but not cooling?
Possible causes include a dirty filter, failed capacitor, thermostat problem, low refrigerant, frozen evaporator coil, dirty condenser coil, fan failure, or compressor problem.
Is it worth repairing a 15-year-old central AC?
A small repair may be worthwhile, but expensive compressor, coil, or refrigerant work usually justifies comparing replacement. Older systems may also be less efficient and more likely to need additional repairs.
Can I recharge my central AC myself?
No. Opening and recharging a stationary AC refrigerant system should be handled by an appropriately EPA-certified technician.
Does homeowners insurance cover AC repair?
Standard homeowners insurance generally does not cover normal wear, age, corrosion, or mechanical breakdown. It may cover damage caused by a separate covered event, depending on the policy.
Conclusion
Central AC repair costs vary considerably by problem. A clogged drain line may cost $75 to $200, while a capacitor or contactor commonly costs a few hundred dollars. Refrigerant leaks, coils, motors, and compressors can raise the bill to $600, $1,500, or more.
Before approving an expensive repair, ask for a written diagnosis, warranty information, and the complete price including labor and refrigerant. When the system is older than 10 to 15 years or the repair approaches half the price of replacement, compare the long-term costs of installing a new central AC.