An outside unit that hums while the fan stays still is the call we get most in July in Charleston, SC, and the cause is usually a failed run capacitor. That inexpensive component starts the compressor and fan, fades for years without complaint, and then quits under peak load. It is far from the only suspect, though. Contactors pit and stop passing clean power, condenser fan bearings dry out, small refrigerant leaks drain away cooling capacity, and evaporator coils ice over when a clogged filter strangles airflow.
At Charleston HVAC, every AC repair starts with measurement. Capacitors are metered against the rating on the label. Amp draws on the compressor and fan motor are compared to the data plate. Refrigerant charge is judged by superheat and subcooling, not by pressure readings alone, and any icing prompts a look at the evaporator coil, blower wheel, and filter. This matters because one warm-air complaint can hide four different faults at four very different prices, and a refrigerant top-off that ignores the leak is just a short-term rental on cold air.
Central air, heat pumps running in cooling mode, and ductless mini splits from every major brand are all in our wheelhouse. Because our trucks carry capacitors, contactors, fan motors, hard-start kits, and condensate pumps, most AC repairs are completed the same visit. If the compressor has failed on an older system, we tell you so directly and show you the numbers on repairing versus replacing. Call (843) 268-6960 for fast AC repair in Charleston.
Heating trouble instead? See Furnace Repair in Charleston.
How Much Does AC Repair Cost in Charleston?
For most Charleston homeowners, an AC repair comes in somewhere between $150 and $650. The part that failed drives the price: a capacitor is a quick, inexpensive fix, while a coil or compressor is a major repair. You'll get an upfront quote from Charleston HVAC before we touch a single part.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Capacitor replacementThe most common AC failure; outdoor unit hums but won't start | $150–$400 | The most common AC failure; outdoor unit hums but won't start |
| Contactor replacementBurned or pitted switch that powers the outdoor unit | $150–$350 | Burned or pitted switch that powers the outdoor unit |
| Condenser fan motorFan won't spin, unit overheats and shuts down | $300–$700 | Outdoor fan stops, compressor trips on high heat |
| Refrigerant leak repair + rechargeDepends on leak location and refrigerant type | $300–$1,500 | Varies with where the leak is and how much charge is lost |
| Evaporator coil replacementCorroded or leaking indoor coil | $1,000–$2,500 | Major repair; worth weighing against replacement on older systems |
| Compressor replacementOn systems past 10–12 years, replacement usually makes more sense | $1,500–$3,000 | Largest single repair; often weighed against a new system |
Typical ranges for common repairs. Your exact price is quoted after diagnosis.
What Affects the Price
- How old the unit is and how easy its parts are to source
- Refrigerant type, because R-22 recharges are much more expensive
- Timing, such as same-day or after-hours service versus a scheduled visit
- Access to the equipment, like rooftop units or tight attic air handlers
When a quote climbs toward the cost of replacement on an older unit, we'll lay out repair and replacement prices together, with no pressure either way. Questions about cost? Call (843) 268-6960.
When to Call for AC Repair in Charleston
Recognizing the warning signs early can save you time, money, and prevent significant damage to your property. Watch for these telltale signs that professional help is needed:
- Puddles near the air handler or water stains on the ceiling beneath it
- Rapid on-off cycling that never brings the temperature down
- Vents blowing air that is barely cooler than the room
- A hot electrical smell or a tripped breaker whenever the air conditioner kicks on
- A condenser fan that sits still while the outdoor unit hums
- Frost or ice forming on the copper lines or the indoor coil
- A hiss or gurgle from the lines, a common sign of leaking refrigerant
- Higher summer bills even though the house still feels warm and humid
Don't Wait for a Total Failure
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. Don't wait, get Charleston HVAC on the phone at (843) 268-6960 and we'll take a look right away.
AC Repair Issues? We Can Help.
Our experienced technicians are standing by to help.
Call (843) 268-6960 NowAC Repair FAQ
Why Professional AC Repair Matters
An air conditioner packs several hazards into one cabinet. The capacitor can deliver a painful shock long after the breaker is off, the condensing unit is wired for 240 volts, and the refrigerant circuit is a sealed, pressurized loop that federal rules forbid venting. Servicing it properly takes gauges, a recovery machine, and a vacuum pump, not a DIY recharge can. Diagnosis has its own traps. A frozen coil is as likely to be an airflow issue as a charge issue, and recharging a system that still leaks wastes money while moisture and acid work on the compressor.
Professional service sees the full picture, not just the symptom. Our technicians meter electrical parts before replacing them, make charge decisions from measured superheat and subcooling, locate leaks with electronic detectors and dye, and check the filter, blower, and static pressure any time airflow could be the issue. The result is a repair that lasts the season instead of a guess that fails in three weeks. If your system is not worth saving, we will tell you directly, backed by numbers rather than a sales pitch.
Our AC Repair Process
We work through a clear, repeatable process so nothing gets overlooked on your property. Here's what you can expect when you choose Charleston HVAC:
Testing First
Before any part comes out, we meter the electrical components, read the refrigerant charge with superheat and subcooling, and look over the coil, filter, and condensate line for the actual cause.
Clear Explanation & Price
We show you what failed and why, then give a firm price before any work begins. If the compressor or coil points toward replacement instead, we lay out the honest math.
Repair From a Stocked Truck
Most AC fixes happen right away. We carry capacitors, contactors, fan motors, and other high-failure parts, so you are rarely left waiting on a parts order.
Performance Verification
We confirm a healthy temperature split across the coil, verify amp draws and charge, clear the condensate line, and watch a full cooling cycle before we leave.
Not Sure What You Need?
Our experienced technicians can assess your situation and recommend the best solution.
Get Help: (843) 268-6960Maintenance Tips for AC Repair
A few simple habits now, like regular filter changes and seasonal tune-ups, can add years to your system's life. Here are our expert recommendations:
- Avoid shutting registers in unused rooms, which raises static pressure and stresses the blower
- Start each cooling season by flushing the condensate line so algae cannot block it
- Have the AC serviced every spring, ahead of the first real heat
- Rinse the outdoor condenser coil each spring and keep vegetation two feet back
- Swap filters monthly while the AC is running hard to keep the evaporator coil from icing
- Shade helps, but never enclose the outdoor unit; it needs free airflow on all sides
- Pay attention to buzzing or clicking when the AC starts, a common warning of a failing capacitor
Comparing DIY and Professional AC Repair
Some simple checks are suitable for DIY, but most heating and cooling repairs benefit from professional tools, training, and experience. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Refrigerant Leaks | Recharge cans that ignore the leak | Leak repaired and correct charge restored by weight |
| Shock Risk | Stored capacitor charge and live 240V | Capacitors drained, power confirmed off |
| Frozen Coils | Thawed and refrozen on repeat | Root cause found: airflow or charge |
| Troubleshooting | Picking a likely part and hoping | Instrument readings, not hunches |
| Parts | Parts that are almost the right rating | Ratings matched to the data plate |
| Outcome | Short-lived relief | Repair verified under real load |
Schedule Your AC Repair Service
Don't let a failing system get worse. Call Charleston HVAC now for prompt, professional service.
Call (843) 268-6960 TodayAreas We Serve for AC Repair
We serve Charleston and its neighboring communities for AC repair, from quick same-day repairs to planned installs.