An outside unit that hums while the fan stays still is the classic summer service call in Marietta, GA, 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.
Marietta HVAC repairs air conditioners diagnosis-first. Our experienced technicians test rather than guess: capacitors metered for microfarads against the label rating, compressor and fan amp draws checked against the data plate, refrigerant charge evaluated by superheat and subcooling rather than pressure alone, and the evaporator coil, blower wheel, and filter inspected whenever icing is in the picture. That matters because the same warm-air complaint can be four different faults at four very different costs, and topping off refrigerant without finding the leak just rents you cold air until it escapes again.
We service every common residential cooling system from all major brands, and our trucks stock the summer failure parts: capacitors, contactors, fan motors, hard-start kits, and condensate pumps, so cold air usually returns before we leave the driveway. When a compressor has truly failed on an aging system, we say so plainly and lay out the repair-versus-replace math honestly. For fast AC repair anywhere in Marietta, call (770) 202-3453 and we will get the cold air flowing again.
Heating trouble instead? See Furnace Repair in Marietta.
How Much Does AC Repair Cost in Marietta?
The typical AC repair in Marietta costs $150 to $650. Where you fall in that range depends almost entirely on which component failed. Marietta HVAC diagnoses the problem first and gives you a written price before any work starts.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Capacitor replacementMost common repair, usually same visit | $150–$400 | Most common repair, usually same visit |
| Contactor replacementWorn relay that stops the condenser from starting | $150–$350 | Burned or pitted switch that powers the outdoor unit |
| Condenser fan motorOutdoor fan stops, compressor trips on high heat | $300–$700 | Fan won't spin, unit overheats and shuts down |
| Refrigerant leak repair + rechargeDepends on leak location and refrigerant type | $300–$1,500 | Depends on leak location and refrigerant type |
| Evaporator coil replacementCorroded or leaking indoor coil | $1,000–$2,500 | Major repair; worth weighing against replacement on older systems |
| Compressor replacementLargest single repair; often weighed against a new system | $1,500–$3,000 | On systems past 10–12 years, replacement usually makes more sense |
Typical ranges for common repairs. Your exact price is quoted after diagnosis.
What Moves the Cost Up or Down
- The age of the system and whether parts are still readily available
- 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
If a repair would cost more than a third of a new system, or your AC is past 12 to 15 years old, we'll show you both numbers side by side so you can decide. Call (770) 202-3453 for a quote.
Warning Signs for AC Repair
Spotting the early warning signs gives you the chance to act before the situation spirals into something far more expensive. These are the signals our technicians see most often when a problem is underway:
- Frost or ice forming on the copper lines or the indoor coil
- Rising electric costs paired with a sticky, uncomfortable house
- Clicking or humming outside with no fan movement
- Hissing or bubbling sounds that suggest a refrigerant leak
- Warm or room-temperature air blowing when the thermostat calls for cooling
- A hot electrical smell or a tripped breaker whenever the air conditioner kicks on
- Rapid on-off cycling that never brings the temperature down
- Water dripping from the indoor unit or showing up on the ceiling below
Don't Wait for a Total Failure
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Call Marietta HVAC at (770) 202-3453 at the first sign of trouble.
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Why Hire a Professional for AC Repair?
Start with the refrigerant. It lives in a sealed, pressurized loop, venting it is prohibited under federal rules, and correct service requires gauges, a vacuum pump, and a recovery machine rather than a store-bought recharge kit. Add capacitors that hold a dangerous charge with the power off and a condensing unit fed by 240 volts, and the risks add up quickly. Then there are the diagnostic traps: an iced coil often points to poor airflow rather than low charge, and topping off a system with an unrepaired leak lets moisture and acid slowly damage the compressor while your money escapes with the refrigerant.
What you get from a pro is a repair that holds. Our experienced technicians find leaks with dye and electronic detectors, base every charge decision on superheat and subcooling, test electrical parts with a meter before condemning them, and measure static pressure and inspect the blower and filter whenever airflow is in question. Parts-cannon fixes tend to bring you back in a few weeks. Ours are built to last through the heat. And if the numbers say replacement is the better call, we show you those numbers honestly, without pressure.
What to Expect From Our AC Repair
We work through a clear, repeatable process so nothing gets overlooked on your property. Here's a look at each step our Marietta HVAC team takes:
Testing First
Capacitors, the contactor, motors, and amp draws are all measured, the charge is checked through superheat and subcooling, and the coil, filter, and drain are inspected so the real failure is found.
Findings & Firm Quote
Nothing happens without your approval. We explain what broke and why, quote a firm price, and, if the compressor or coil has failed, walk you through repair versus replacement honestly.
On-the-Spot Fix
Most AC fixes happen right away. We carry capacitors, contactors, fan motors, and other high-failure parts, so there is rarely a wait on a parts order.
Test Under Load
Before we head out, we measure the temperature split, recheck amp draws and refrigerant charge, flush the condensate line, and run the system through a complete cooling cycle.
Want a Professional Opinion?
Our experienced technicians can assess your situation and recommend the best solution.
Call (770) 202-3453 NowHow to Prevent AC Repair Problems
Smart maintenance is almost always cheaper and easier than an early replacement. Put these technician-approved steps to work around your property:
- Keep shrubs two feet from the outdoor unit and gently rinse its coil each spring
- Shade helps, but never enclose the outdoor unit; it needs free airflow on all sides
- Have the AC serviced every spring, ahead of the first real heat
- Swap filters monthly while the AC is running hard to keep the evaporator coil from icing
- Keep supply and return vents open; closing rooms raises static pressure on the blower
- Listen for new buzzing or clicking at startup, the classic sound of a dying capacitor
- Flush the condensate drain line with the season's first use to head off clogs
Should You DIY or Call a Pro?
Online tutorials may help in a pinch, yet lasting repairs and code-compliant installations usually depend on professional methods and trained technicians. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Refrigerant | Adding refrigerant while it keeps leaking | Leak repaired and correct charge restored by weight |
| Shock Risk | Risk of shock from 240V and stored charge | Power verified off, capacitors discharged |
| Iced Coils | Thawed and refrozen on repeat | Root cause found: airflow or charge |
| Diagnosis | Picking a likely part and hoping | Instrument readings, not hunches |
| Replacement Parts | Close-enough capacitors and motors | Specs matched to the equipment data plate |
| Outcome | Short-lived relief | Fix proven under full cooling load |
Get AC Repair Help Today
Don't let a failing system get worse. Call Marietta HVAC now for prompt, professional service.
Call (770) 202-3453 NowAC Repair Across the Marietta Area
Our technicians handle AC repair throughout Marietta and the surrounding communities, with the same upfront pricing everywhere we work.