Mount Pleasant Heating & Air Conditioning · Local AC Repair
AC Repair in Mount Pleasant, SC
Mount Pleasant Heating & Air Conditioning provides air conditioning repair and cooling service for homeowners in Mount Pleasant, South Carolina, and the surrounding Charleston-area and Lowcountry communities. If your AC is blowing warm air, cycling on and off, leaking water, or simply not keeping up with the heat, our technicians can diagnose the problem, lay out your options, and get reliable cooling restored.
Mount Pleasant’s Local AC Team
Local AC Repair for Mount Pleasant Homeowners
Mount Pleasant Heating & Air Conditioning is based in Mount Pleasant, South Carolina, and has repaired and installed HVAC systems across the Lowcountry since 2007. When an air conditioner stops cooling properly, the cause is rarely obvious — it can involve airflow, controls, the thermostat, electrical components, or refrigerant-related conditions. A proper diagnosis comes before any repair recommendation.
We provide air conditioning repair for homeowners and businesses throughout Mount Pleasant and the surrounding Charleston-area communities. Same-day appointments are often available, pricing is explained before work begins, and the quality and reliability of every job is guaranteed.
From central AC systems to heat pumps and ductless units, our technicians work on all major brands — helping homeowners understand whether a repair, maintenance, or replacement is the right path for their equipment.
What We Diagnose
AC Problems We Help Diagnose
These are the cooling problems Mount Pleasant homeowners call us about most often — what they usually mean, and when it’s worth getting a professional look.
AC Blowing Warm Air
An air conditioner that runs but pushes warm air can point to low refrigerant, a dirty outdoor coil, a failing compressor, or a thermostat problem. The symptom alone doesn’t reveal the cause, which is why a proper diagnosis matters.
When to call: the AC has not cooled properly for more than a few hours. See why your AC is blowing warm air.
AC Not Turning On
A system that won’t start is often a tripped breaker, a failed capacitor, a thermostat issue, or a wiring problem. If the unit won’t come on after checking the thermostat and breaker, it’s worth a professional look.
When to call: the AC will not turn on after checking the thermostat and breaker. See why AC trips the breaker.
Weak Airflow
Weak airflow from the vents usually traces back to a clogged filter, a dirty blower, or blocked ducts. Replacing the filter is a reasonable first step; if airflow stays weak, the blower or ducts may need attention.
When to call: airflow stays weak after replacing the air filter. See how to improve airflow.
Uneven Cooling
Some rooms cooler than others can mean the system is undersized for the home, the ducts are leaking, or airflow is simply unbalanced. It’s a comfort issue first, but it can also strain the equipment over time.
When to call: hot and cold spots are consistent from room to room. See how to troubleshoot uneven cooling.
Short Cycling
When an AC turns on and off in short bursts, it never runs long enough to cool the house, and the equipment wears out faster. Oversized equipment, low refrigerant, or a failing limit switch are common causes.
When to call: the system cycles frequently without reaching the set temperature. See why AC short cycles.
Strange AC Noises
Banging, squealing, or hissing from the system usually means a part is loose, a motor is failing, or pressures are off. New noises tend to get worse, and catching them early keeps the repair smaller.
When to call: the noise is new, loud, or getting worse.
Water Leaking from the System
Moisture around the indoor unit or drain line is often a clogged condensate drain or a frozen coil. In humid Lowcountry weather, leaks can quickly damage walls and floors, so they’re best caught early.
When to call: water collects around the unit or you notice damp spots. Learn about condensate drain clogs.
Thermostat Problems
A thermostat that shows the wrong temperature, blanks out, or ignores settings will make the whole system misbehave. Sometimes it’s a programming issue; other times the thermostat itself needs to be replaced.
When to call: changing the settings does not change what the system does. Thermostat service can help.
The Diagnostic Visit
What Happens During an AC Diagnostic Visit
A diagnostic visit is how we find out why your AC isn't cooling before we recommend anything. Here's what it usually includes:
- A conversation about what you noticed and when it started
- Checking the thermostat settings, wiring and the signal to the equipment
- Testing the capacitor, contactor and motors at the outdoor unit
- Measuring refrigerant pressures and line temperatures
- Checking the filter, blower, evaporator coil and condensate drain
- A plain-language explanation of the cause, your options and the price
Most visits take under an hour. Read what to expect from an AC repair visit.
What We Do
AC Repair Services in Mount Pleasant
Cooling repair, diagnostics, installation, and maintenance for central air systems throughout Mount Pleasant and the Charleston area.
AC Diagnostics
When an air conditioner runs but the home stays warm, the cause isn’t always clear. A diagnostic visit checks airflow, controls, electrical components, and refrigerant-related signs to identify what’s actually wrong before any repair is recommended.
Central AC Repair
From split systems to packaged units, we repair central air conditioners of all major brands. The goal is steady, reliable cooling, whether the issue is a worn part, a leak, or something that simply needs adjustment.
Emergency AC Repair
A broken air conditioner in Lowcountry heat is an emergency. We offer 24/7 emergency AC repair service, so there’s a number to call when cooling fails outside normal hours — including weekends and severe weather.
AC System Troubleshooting
Not sure what’s wrong? We walk through the system step by step — thermostat, airflow, electrical, and refrigerant-related symptoms — and explain what we find in plain language, with options and pricing before work begins.
Thermostat Service
A thermostat that reads wrong or won’t respond can make a good system feel broken. We troubleshoot, reprogram, and replace thermostats, including smart and programmable models.
AC Maintenance
Seasonal tune-ups catch developing issues, keep airflow clean, and help the system cool dependably when demand is highest. We can recommend a schedule that fits your equipment and usage.
AC Installation & Replacement
When repair is no longer the practical answer, we size and install new air conditioners for Mount Pleasant homes, matched to the property and the local climate.
Heat Pump & Ductless Service
Heat pumps and ductless mini-split systems are common in the Charleston area. We repair, maintain, and install them for homes throughout Mount Pleasant.
Common Repairs
AC Repairs We Make Most Often in Lowcountry Homes
Long, humid summers and salt air are hard on air conditioners here. These are the repairs we handle most often around Mount Pleasant:
- Failed capacitors and contactors. These electrical parts wear out fastest in long, hot summers, and they’re a common reason an outdoor unit hums but won’t start. See why your AC isn’t working.
- Clogged condensate drains. High humidity means your AC removes a lot of water, and a clogged drain line can leak or shut the system off. Learn the signs of a clogged condensate drain.
- Corroded coils and outdoor parts. Homes near the harbor, creeks and marsh see faster corrosion from salt air. Read about coastal HVAC corrosion repair.
- Frozen evaporator coils. Usually caused by an airflow or refrigerant problem. Here’s what to do when your AC freezes up.
- Refrigerant leaks. We find and repair the leak rather than just topping off refrigerant. Know the signs of low refrigerant.
- Blower and fan motor problems. Weak airflow or a fan that won’t spin often traces back to a motor, belt or capacitor.
- Control board damage from summer storm surges. Electrical surges can damage the sensitive electronics that run the system.
- Thermostat and control issues. Sometimes the AC is fine and the controls aren’t. See our thermostat services.
How AC Repair Pricing Works
Every repair starts with a diagnosis, and you get the price before any work begins. Cost depends on the part, your equipment and the time of the call. For typical ranges, see our guide to AC repair costs in Mount Pleasant and how service call and diagnostic fees work. If your AC fails at night or on a weekend, our 24-hour AC repair service can help.
Refrigerant
Low Refrigerant Means a Leak
An air conditioner doesn't use up refrigerant the way a car uses gas. If it's low, it's leaking, and adding more without fixing the leak just postpones the next breakdown.
- Common signs include warm air, ice on the lines, a hissing sound and longer run times.
- Leaks often show up at coil joints, service valves and spots where tubing rubs.
- Only EPA-certified technicians can legally handle refrigerant.
- Older systems using R-22 cost more to recharge because new R-22 hasn't been produced in the U.S. since 2020.
We locate the leak, explain whether it's worth repairing, and then charge the system correctly. See how to spot refrigerant leaks.
Know the Signs
Signs Your Air Conditioner May Need Service
A few straightforward things to watch for during the cooling season — and when each one is worth a call.
Cooling Performance
- Warm air from the vents — cooling never seems to catch up
- Unusual noises — grinding, squealing, or hissing while running
- Weak airflow — little air moving from the registers
- Frequent cycling — short on-and-off bursts instead of steady runs
Comfort & Condition
- Inconsistent room temperatures — some rooms stay noticeably warmer
- Water around the equipment — leaks or damp spots near the unit
- Struggling to hold the thermostat setting — the house never quite reaches it
- Repeated shutdowns — the system kicks off on its own
Repair or Replace
Should You Repair or Replace Your AC?
There’s no single age at which an air conditioner must be replaced, and there’s no universal rule for when to keep repairing one. The right answer depends on the individual system — how old it is, how it has been performing, and what the repair would involve.
If the fix is straightforward and the system is otherwise in good shape, repair is usually the sensible path. If the unit is older, needs frequent repairs, or is struggling to cool the home efficiently, replacement can often cost less over time than a long string of fixes.
You can also read our guide to repair versus replacement for your HVAC system for a closer look at the factors involved.
Not sure which path fits your AC? A professional evaluation can give you a clear picture of the system’s condition and your options.
What Homeowners Typically Consider
- Age of the system — older units are more likely to fail
- Frequency of repairs — how often it has needed service recently
- Repair cost — how the estimate compares to replacement
- Performance — whether the home stays cool and comfortable
- Comfort problems — uneven or inconsistent cooling between rooms
- Efficiency — rising energy use is a common sign of decline
- Parts availability — older equipment can be harder to source parts for
- Condition of major components — compressor, coil, and blower
Why Choose Us
Why Mount Pleasant Homeowners Choose Mount Pleasant Heating & Air Conditioning
Local Service
Based in Mount Pleasant, with technicians who know the area’s homes and its hot, humid cooling season.
Professional Diagnosis
We explain what’s wrong and what it will cost before any work begins — no guessing, no surprises.
Heating & Cooling Experience
Repairing and installing HVAC systems for Lowcountry homes and businesses since 2007.
Quality Guaranteed
The quality and reliability of every service is guaranteed — on all major brands.
After the Repair
Help Your AC Stay Fixed
A few habits after a repair make another service call less likely:
- Replace the air filter on schedule, every one to three months, more often during pollen season.
- Keep shrubs, grass clippings and pine straw at least two feet from the outdoor unit.
- Don't set the thermostat far below your target. The AC cools at the same speed regardless.
- Keep supply vents and return grilles open, even in rooms you don't use.
- Call us if you notice the same symptom returning, before it turns into a bigger repair.
See ways to extend AC life for more.
Local Comfort
Keeping Mount Pleasant Homes Cool
Mount Pleasant sits across the harbor from Charleston, and summers here bring long stretches of heat and humidity that put steady demand on an air conditioner. When a system is asked to cool through those months, small issues — a dirty coil, a struggling blower, low airflow — tend to surface as comfort problems first.
Getting ready for the season? Our summer AC prep guide covers the basics, and if replacement is on the table, our guide to choosing AC size for a Charleston home explains why sizing matters.
Before You Call
Five Safe Checks When Your AC Stops Cooling
Some service calls turn out to be a setting or a tripped switch. These checks are safe for any homeowner:
- Thermostat: make sure it’s set to Cool, the setting is below room temperature, and the screen is on. Replace the batteries if it has them.
- Air filter: a clogged filter can make the indoor coil freeze. If you see ice on the copper lines, turn cooling off, set the fan to On and let it thaw before calling.
- Breakers: reset a tripped AC breaker once. If it trips again, leave it off. Repeated trips point to an electrical or compressor problem.
- Outdoor unit: check that the fan is spinning and nothing is blocking the sides. Don’t open the panels or reach inside.
- Drain safety switch: many systems shut off when the condensate pan fills. Standing water near the indoor unit usually means a clogged drain line.
If none of these explain it, it’s time for a technician. Learn more about an AC blowing warm air and an AC that keeps tripping the breaker.
24-Hour AC Repair
When to Call for Emergency AC Repair
Our 24-hour AC repair line is (843) 714-0863, any time, day or night, including weekends. Here’s how to tell what can’t wait.
Call right away if:
- The AC has stopped cooling completely during a heat advisory.
- A burning plastic or ozone smell comes from the vents. That points to an electrical failure, which is a fire hazard.
- You hear loud grinding or screeching. Shut the system off. It can mean a failing motor or a broken fan blade.
- Someone in the home is vulnerable to heat, such as an older adult, an infant or a pet. High humidity keeps the body from cooling itself.
- Heat could damage equipment or inventory in a business.
It can usually wait until morning if:
- The AC still blows cold air but doesn’t reach the thermostat setting. Check the filter first.
- You hear a minor rattle that doesn’t stop the cooling. It is often a loose panel or debris.
- The air is warm but the house is still at a safe temperature and no one is at risk. Warm air often points to a refrigerant leak or a failed compressor, so don’t wait long if the house is heating up.
While you wait: turn the system off at the thermostat if it’s icing up, leaking, or making grinding, buzzing or burning smells. Reset the breaker once, and leave it off if it trips again. Move children, older family members and pets to the coolest room, close the blinds and use fans. Clear a path to the indoor unit and the outdoor condenser.
When you call: tell us what the system is doing (no cooling, water, noises or smells), whether the breaker has tripped, and whether anyone at home is at risk from the heat. We’ll tell you what you can safely do while you wait and when a technician can get to you. The technician diagnoses the problem and gives you the price before any repair begins.
Common Questions
AC Repair Questions from Mount Pleasant Homeowners
Straight answers to the cooling questions we hear most from homeowners in Mount Pleasant and the surrounding area.
Do you provide AC repair in Mount Pleasant?
Yes. Mount Pleasant Heating & Air Conditioning provides AC repair for homeowners throughout Mount Pleasant and the surrounding Charleston-area communities. Call (843) 714-0863 to describe the problem and arrange an appointment.
What are signs that an air conditioner needs repair?
Warm air from the vents, weak airflow, unusual noises, frequent cycling, uneven room temperatures, water around the unit, and a system that can’t hold the thermostat setting are all signs worth having checked. The sooner an issue is looked at, the more likely the fix stays small.
Can you diagnose an AC that is running but not cooling?
Yes. A system that runs without cooling is one of the most common calls we take. A diagnostic visit can identify whether the problem is airflow, controls, electrical components, or refrigerant-related, and we explain the options and pricing before work begins.
Do you provide emergency AC repair?
Yes — our 24/7 emergency AC repair service covers Mount Pleasant and the surrounding area. If cooling fails outside regular hours, call (843) 714-0863 and we’ll help you get it addressed.
How quickly can an AC technician come to Mount Pleasant?
We offer same-day appointments when available, and because we’re based in Mount Pleasant, most addresses are a short drive away. Call (843) 714-0863 to check the earliest opening.
Should I repair or replace an older air conditioner?
It depends on the individual system. Age, repair history, performance, efficiency, and the condition of major components all matter, and there’s no single age that forces a replacement. An AC evaluation can give you a clear answer for your equipment.
How often should an air conditioner be maintained?
Many homeowners schedule a tune-up before the cooling season, but the right frequency depends on the equipment, its age, and how it’s used. Our AC maintenance service can help you find a schedule that fits.
Which Mount Pleasant neighborhoods and nearby areas do you serve?
We serve Mount Pleasant neighborhoods including I’On, Belle Hall, Park West, and Dunes West, along with Charleston and the surrounding Lowcountry communities. If you’re unsure whether your address is covered, call (843) 714-0863.
Should I turn off my AC if it stops cooling?
Yes. A system that runs without cooling is under stress, and keeping it on can lead to a seized compressor or a frozen evaporator coil, which makes the repair bigger. Turn it off at the thermostat and call.
What should I do if my AC is making a loud buzzing sound?
Turn the system off. Loud buzzing or humming often points to an electrical problem such as a failing capacitor or a stuck contactor, and running it can burn out the compressor motor. Then call for service.
Can I wait until morning if my AC is blowing warm air?
You can if the indoor temperature is still safe and no one at risk, such as an older adult or an infant, is at home. But warm air often signals a refrigerant leak or a failed compressor, and a house heats up quickly in summer. If the heat becomes unbearable, call for emergency service.
Is 24-hour AC repair more expensive than a scheduled visit?
Emergency calls can be priced differently from scheduled visits. Either way, the technician diagnoses the problem first and gives you the price before any repair begins.
Need AC Repair in Mount Pleasant?
Our local team is ready to diagnose the problem and restore your cooling.
Call (843) 714-0863 Request Service
Service Areas
AC Repair Service Areas in Mount Pleasant
Choose your area for AC repair information, or call (843) 714-0863 if you’re unsure whether your address is covered.
Find Us
Based in Mount Pleasant, Serving the Lowcountry
- 1400 Midtown Ave Ste 401, Mt. Pleasant, SC 29464
- (843) 714-0863
- Mon–Sun · 24/7