AC repairin Seneca, SC
Most AC repairs in Seneca come down to a capacitor, contactor, fan motor, clogged drain or refrigerant leak, and the visit starts with a $75–$150 diagnostic.
Tell us what the system is doing and a licensed local HVAC contractor calls back, finds the fault and prices the repair before any work starts. Most not-cooling repairs run $150–$850 on top of the diagnostic.
What are the signs your AC needs a repair?
Call for a repair when the system runs but the house won’t cool, the outdoor fan won’t spin, the breaker keeps tripping, or water collects around the indoor unit.
- Air from the vents that is barely cooler than the room
- The outdoor unit humming while its fan sits still
- Short runs, switching on and off every few minutes
- Water around the indoor unit, or a ceiling stain below an attic unit
- Ice on the copper lines or the indoor coil
- Grinding, squealing or rapid clicking
What breaks most often in a Seneca summer?
Five faults cover most summer calls: a failed capacitor or contactor, a worn outdoor fan motor, a refrigerant leak, a clogged condensate drain and an iced coil. Long runs from June to September, in heat and lake humidity, wear these parts first.
- Capacitor or contactor. The capacitor gives the compressor and fan their starting kick; heat wears it out. The contactor is the switch the thermostat closes. Either repair runs $150–$400.
- Outdoor fan motor. When the fan stops, the compressor overheats and shuts itself off. A new motor runs $350–$850.
- Refrigerant leak. Refrigerant doesn’t get used up, so low refrigerant means a leak, often at the indoor coil or a fitting. Fixing it runs $300–$1,500, plus refrigerant.
- Clogged condensate drain. Algae chokes the drain line, the pan fills, and a float switch shuts the system off to stop a flood. Clearing it runs $100–$250.
- Iced coil. Ice is a symptom of a dirty filter, a weak blower or low refrigerant. Turn the cooling off to let it thaw, then read why AC coils ice up and what to do.
What happens on the diagnostic visit?
The technician finds the fault, tells you what it is and what the repair costs, and you decide before any work starts. The visit costs $75–$150 in business hours, and many contractors credit it toward the repair.
A thorough visit goes in this order:
- What you noticed, and when it started
- Thermostat, breakers, the outdoor disconnect and the filter
- At the outdoor unit: capacitor, contactor, fan motor, compressor and refrigerant readings
- At the indoor unit: blower, coil, drain line and float switch
- A price for the repair, and a word on age or refrigerant if they change the advice
What moves the price of an AC repair?
The part, the refrigerant and the system’s age. The table on this page shows typical Seneca ranges; most not-cooling repairs come to $150–$850 on top of the diagnostic.
- The part and how hard it is to reach. A capacitor is a short job. An indoor coil in a tight attic can take most of a day.
- Warranty. A registered system under its parts warranty usually costs labor and refrigerant only.
- Refrigerant. On an older system it can double the bill.
How does the refrigerant type change the repair cost?
It matters whenever refrigerant is added: R-410A costs $60–$110 a pound installed, R-22 costs $125–$250 a pound, and the newest systems use different refrigerants and parts again.
- R-410A is in most systems built from 2010 through 2024. Servicing it is legal, but its wholesale price has roughly doubled since 2024.
- R-22 went out of production in 2020, and only reclaimed supply is left. A big repair on an R-22 system is a signal to replace it.
- A2L refrigerants (R-454B and R-32) are in systems made since January 1, 2025, most still under warranty. The catch for older systems: a new A2L outdoor unit can’t be paired with an R-410A indoor coil, so when an old outdoor unit dies, you usually replace both halves.
When should you stop repairing an old AC?
When the system is over 10 years old and the repair is a big one, or when the $5,000 rule says so: multiply the system’s age by the repair cost, and if the answer passes 5,000, price a replacement too.
A 12-year-old system facing a compressor at $1,500–$3,500 fails that test easily; a 6-year-old one needing a capacitor passes. Our guide on repairing or replacing an AC works through the numbers; AC and heat pump replacement covers the new system.
What should you check before calling?
Four checks take a few minutes and sometimes fix the problem: the thermostat, the breakers, the filter and the condensate drain.
- Thermostat. Set to Cool, setpoint below room temperature, fan on Auto. Replace the batteries if it takes them.
- Breakers. Usually one for the indoor unit and one for the outdoor unit, plus a disconnect box by the condenser. Reset a tripped breaker once. If it trips again, leave it off and call.
- Filter. A clogged filter chokes airflow and can ice the coil. Swap it.
- Drain and float switch. If the pan under the indoor unit is full, the float switch has cut the power. A wet-dry vacuum on the drain line’s outdoor end often clears it.
Leave the outdoor unit’s electrical panel closed: capacitors hold a charge after the power is off. If the checks don’t sort it out, request a repair visit and say what you’ve already tried.
What it costs
Typical installed prices in the Upstate. A ballpark, not a quote: the contractor prices your job after seeing it.
| Job | Typical price | What moves it |
|---|---|---|
| Diagnostic visit | $75–$150 | The minimum for any repair call: the trip and finding the fault. Many contractors credit it toward the repair. |
| Capacitor or contactor | $150–$400 | The commonest summer repair. A dual-run capacitor costs more than a single one. |
| Outdoor fan motor | $350–$850 | Motor size and whether the fan blade goes too. |
| Clogged condensate drain | $100–$250 | Clearing the line and resetting the float switch. A failed condensate pump adds the part. |
| Refrigerant leak repair | $300–$1,500 | Finding and fixing the leak, before refrigerant. R-410A runs $60–$110 a lb installed. |
| Refrigerant top-up | $200–$650 | A typical 2 to 4 lb of R-410A with labor. A system that needs it every year has a leak. |
| Indoor blower motor | $450–$1,000 | A standard motor. A variable-speed (ECM) motor runs $900–$2,000. |
| Indoor (evaporator) coil | $1,200–$3,000 | Out of warranty. Under the parts warranty you pay labor and refrigerant. |
| Compressor | $1,500–$3,500 | Out of warranty. On a system over 10 years old, price a replacement first. |
Common questions
Is it worth adding refrigerant without fixing the leak?
Rarely. A top-up runs $200–$650, and the refrigerant leaks out again, often by next summer. Finding and fixing the leak costs more once and stops the yearly bill.
Can I replace an AC capacitor myself?
It isn't a safe job: a capacitor can hold a dangerous charge after the power is off. A technician also checks why it failed, since a weak fan motor or a loose wire can kill the next one. The repair usually runs $150–$400.
Is an AC that runs all afternoon in July broken?
Not necessarily. On the hottest afternoons a correctly sized system can run almost nonstop, and long runs are how it pulls moisture out of the air. Call if the house can't get near the setpoint by evening or the air feels damp.
Does the manufacturer's warranty pay for an AC repair?
Often for the part, not the labor. Parts warranties typically run 10 years when the system was registered within 60 to 90 days, or 5 years if it wasn't; labor and refrigerant are usually yours to pay.
How do I check that an HVAC contractor is licensed in South Carolina?
Look the contractor up at verify.llronline.com, the license search run by the SC Department of Labor, Licensing and Regulation. Ask for the license number when they call back.
Other heating and air work
- Heat pump repairWinter heat pump faults, backup heat that won't shut off and gas furnace repairs, with typical Seneca prices.
- System replacementNew heat pumps, central AC and gas or dual fuel systems: sizing, efficiency and what a good quote lists.
- Mini-splitsDuctless heat pumps for bonus rooms, garages, additions, sunrooms and homes without ducts, one room to four.
- Tune-upsSpring and fall tune-ups for heat pumps, AC and furnaces: what a real one checks and what to do yourself.
- DuctworkDuct cleaning when warranted, plus sealing and repair for leaky, crushed or wet crawlspace and attic ducts.
Get a ballpark now
Pick what fits and get a ballpark now. Then a licensed local HVAC contractor calls or texts with a real price after seeing the system.
Call, text or ask for a price
Seneca Heat & Air
Seneca and Oconee County
Mon–Sat, 7am–7pm