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AC Repair in Mount Pleasant, SC

Certified and Licensed | SC Mechanical Contractor #M111694 | Right-sized, high-efficiency systems | Financing available | Serving the coast since 1947

Call 843-305-5728 to get a free quote!

 Call for a free estimate
843-305-5728

Why is my AC running but not cooling?
  • Short Answer: The usual causes are low refrigerant from a leak, a dirty or salt-corroded coil, a failing compressor, or a frozen coil. In Mount Pleasant the long humid summer and marsh and harbor salt work systems hard, so corroded coils, worn capacitors, and tired compressors are common reasons a unit runs without cooling. 

Refrigerant does not get used up, so if it is low there is a leak to find and fix, not just top off. A salt-touched coil cannot shed heat well, and a frozen coil leaves you with air moving but no cool. We check the simple, less expensive causes first and show you what we find before recommending anything bigger, because we would rather fix it right the first time than have you call us back next week. On the larger Mount Pleasant homes that run more than one system, we check each zone so the whole house is right, not just one floor.

When the AC quits in the Mount Pleasant heat, we get you cool again. From our North Charleston office we cover all of Mount Pleasant, from the Old Village to Park West, Carolina Park, and Dunes West, and out to the beach houses on Sullivan's Island and Isle of Palms. We repair central air, heat pumps, and ductless and zoned systems, and we know the marsh salt that wears them down. We diagnose, explain your options, and get your okay before any work. Call (843) 723-3887.

Certified and Licensed | SC Mechanical Contractor #M111694  

a man in a white shirt with an american flag on his sleeve is working on a electrical outlet
How does the coastal salt and marsh air affect my AC in Mount Pleasant?
  • Short Answer: It wears it faster. Mount Pleasant wraps around Charleston Harbor, Shem Creek, and the Wando River, and the barrier islands it borders get open-ocean salt. Salt corrodes coils and electrical parts, so a coastal unit often lasts closer to 7 to 12 years instead of 12 to 15 without care.

Think of it like a boat left in the salt: rinse it and it lasts, leave the salt on and it eats the metal. A unit on the marsh in Mount Pleasant, or out at a beach house on Sullivan's Island or Isle of Palms, sits in that salty air every day. A gentle fresh-water rinse of the coil every few weeks with the power off, no pressure washer, plus a professional check about once a year, slows the corrosion a lot. When it is time to replace, coil coatings or coastal-rated equipment are worth the money here. You can fold those visits into our VIP Maintenance Club.

Certified and Licensed  | SC Mechanical Contractor #M111694

Does my AC need to be raised in a Mount Pleasant flood zone?
Short Answer: Often, yes. Much of Mount Pleasant sits in FEMA AE and VE flood zones along the harbor, creeks, and marsh. The Town of Mount Pleasant sets the floodplain elevation rules, outdoor equipment should be raised above the expected flood level, and an Elevation Certificate may be required in some cases. If your home is near a creek, the marsh, or the harbor, a ground-level condenser can be at real risk in a storm or a high tide. The Town of Mount Pleasant is the permitting authority here, with its own flood ordinance, and the Town is a Class 6 Community Rating System community, which earns residents a 20 percent flood-insurance discount. We can raise or relocate a condenser to get it above expected flood and handle the Town flood and building requirements. In the Old Village, we reconcile that raised placement with the historic screening rules. Treating folks right for the long term is how we have lasted on this coast since 1947.
Do you offer same-day and emergency AC repair in Mount Pleasant?
  • Short Answer: Yes. When your AC goes out in the summer heat, we prioritize emergencies and work nights and weekends across Mount Pleasant. During peak season it can take a little longer, and we will be straight with you about timing when you call. 

A hot house with kids, older family members, or pets is not something we ask you to sit on, and that matters for the older residents and young families across Mount Pleasant. We move emergencies to the front of the line and give you an honest window rather than a promise we cannot keep. Request service or call (843) 723-3887.

A few things to check before you call

  • Set the thermostat to cool and check the batteries.
  • Make sure the AC breaker has not tripped.
  • Check the air filter. A clogged filter is a common, easy fix you can do yourself.

If those look fine and you are still warm, that is when to call us.

Do I need a permit to replace my AC, and what about the coast?

  • Short Answer: Yes. A system replacement needs a mechanical permit, and the authority depends on your address (your city, or the county if unincorporated). Near the water, flood-zone rules may require the new equipment raised above the flood line, and coastal salt means coastal-rated equipment is worth it.

We pull the mechanical permit for your replacement and have the work inspected, through whichever authority covers your address. On the barrier islands and along the marsh, FEMA flood rules can require the condenser raised on a stand above the expected flood line, and the steady salt air rewards corrosion-resistant, coastal-rated equipment that lasts longer near the ocean. Inland, salt is barely a factor and the focus is humidity and efficiency. We size the equipment and the install to where you actually live, which is the same block-by-block read we bring to every Charleston County, Berkeley County, and Dorchester County job.

How much does AC repair cost in Mount Pleasant?

  • Short Answer: Most AC repairs in the Mount Pleasant area run about $150 to $600 after a service call to diagnose the problem. Bigger jobs like a refrigerant leak repair, compressor, or coil cost more. We give you the estimate before we start, so there are no surprises.

Typical area ranges to help you plan, not a quote. Your exact price depends on the part and your system, and we confirm it after we diagnose the unit.

If a repair climbs toward the cost of a new system, we will say so honestly, and financing is available through our financing options.

Typical AC Repair Prices

Diagnostic Service Call $95 to $169
Capacitor or contactor Repair $150 to $450
Refrigerant recharge $200 to $600
Refrigerant leak repair and recharge 450 to $1,500
Fan or blower motor repair $450 to $1,200
Evaporator coil or compressor repair $1,000 to $4,500
Call 843-305-5728

Why Choose Coastal Air Plus?

  • Serving South Carolina Since 1947 – Trusted by homeowners throughout  Myrtle Beach and Charleston.
  • Certified & Licensed Technicians – SC Mechanical Contractor #M111694.
  • Flexible Financing Options – Convenient plans available for new HVAC Installations.
  • Home Service Membership Plans – Regular maintenance to keep your system running smoothly.
  • Highly Rated by Customers – Committed to quality service and customer satisfaction.

Should I repair or replace my AC?

  • Short Answer: Repair a newer system with a small electrical fix. Replace when it is past 10 to 15 years, runs old R-22, the compressor has failed out of warranty, or a repair tops about half a new system. Near the Mount Pleasant marsh and on the islands, salt can bring that replace point a bit sooner. Many Mount Pleasant homes are newer and larger with zoned or multiple systems, so the right answer can differ from one zone to the next, and we will tell you honestly. When replacement is the smart move, our AC installation and replacement team sizes it to your home.

Under about 8 to 10 years old Past 10 to 15 years old
A one-time electrical part (capacitor, contactor) Compressor failed and is out of warranty
Repair is well under a third of a new system Repair tops about half of a new system
System has been maintained Several service calls in the last couple of years
Uses current refrigerant Still runs obsolete R-22
Schedule Repair

Where we work in Mount Pleasant

From the Old Village and Shem Creek to I'On, Park West, Carolina Park, and Dunes West, and out to Sullivan's Island and Isle of Palms, we cover all of Mount Pleasant. We also handle AC repair in Charleston and North Charleston, with the wider region on our Charleston County service area page. For other needs, see furnace repair in Mount Pleasant and plumbing in Mount Pleasant. We cover Mount Pleasant under ZIP codes 29464 and 29466.