Heat Pump Repair and Replacement in Mount Pleasant
Certified and Licensed | SC Mechanical Contractor #M111694 | Right-sized, high-efficiency systems | Financing available | Serving the coast since 1947
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- Short Answer: Salt-driven corrosion on the outdoor unit and wear on the heating-side parts, the reversing valve and the defrost control, account for most calls. Homes closest to the marsh and the creeks see the corrosion first.
The reversing valve flips refrigerant flow so the machine heats instead of cools. The defrost board clears frost off the outdoor coil on damp winter mornings. Neither part exists on a cooling-only system, and both sit idle through a Mount Pleasant summer before being asked to work in January. That is why heat pump calls cluster in the first cold snap.
Corrosion is the slower problem and the one that decides how long the system lasts. Salt reaches coil fins, copper line sets, the cabinet, and the electrical connections at the contactor and disconnect. A unit backing onto marsh grass ages differently from one behind a house off Highway 17, and the recommendation should differ too.
Our technicians test heating and cooling on every call rather than checking whichever mode the weather happens to be asking for. It takes longer, and it is how a reversing valve going bad turns up in July rather than on the coldest night of the year. We would rather fix it right the first time than come back out in a cold snap.
Mount Pleasant sits between the harbor, Shem Creek, and the Wando, and salt is in the air on all three sides. A heat pump here works the whole calendar, pulling humidity out of the house through summer and reversing to heat through winter, while the outdoor unit corrodes faster than the same equipment would twenty miles inland. Repairs commonly run $200 to $700. A full replacement typically lands between $7,500 and $15,000 installed before the Dominion Energy rebate, and the Town requires a mechanical permit on the work.
Those are market ranges, not a quote. Every home is measured and priced on its own.
Call 843-305-5728
Certified and Licensed | SC Mechanical Contractor #M111694
- 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.
Certified and Licensed | SC Mechanical Contractor #M111694
- Short Answer: The Town requires a permit to install, alter, replace, or remove a mechanical system, and Town ordinance sets the trigger at work valued over $1,000 where an inspection is required. A heat pump replacement clears that threshold comfortably. The licensed mechanical contractor pulls the trade permit.
Mount Pleasant handles this through its Building Inspection Division, and mechanical work is a trade permit rather than a full building permit. Trade permits attached to an existing master permit are typically issued the same day. A standalone trade permit, which is what a straight equipment replacement is, may need documentation before it issues, so the contractor should be talking to the Town before the equipment is on the truck.
The Town also verifies contractor licensure through South Carolina LLR before issuing. A contractor whose license or bond has lapsed will find out at the permit counter, which is a poor time to find out.
Component repairs are a different matter and generally do not require a permit. A changeout does. Anyone offering to save you the permit fee is offering to skip the inspection, which is a different transaction than the one you thought you were making.
- Short Answer: Dominion Energy South Carolina pays $400 to $500 on a qualifying ENERGY STAR heat pump replacement, currently at a 15.2 SEER2 minimum, with a licensed mechanical contractor required and the application due within 90 days. Ground source systems are not eligible.
The rebate sets a floor, not a target. The cheapest unit that clears 15.2 SEER2 earns the check, and on this side of the harbor the efficiency rating is only half the question. How the equipment stages its output matters as much as the number on the label, and that is worth working through against your house rather than against a rebate form.
Two things not to plan around this year. The federal Section 25C credit was terminated for installations after December 31, 2025. And South Carolina's HEAR and HOMES rebate programs are funded but have not opened for applications. The Dominion rebate is the incentive that is actually live.
Repair and replacement costs in Mount Pleasant
- Short Answer: Most heat pump repairs run $150 to $1,500 depending on the part. A replacement runs about $7,500 to $15,000 installed before the rebate, plus the Town trade permit.
These are 2026 market ranges for the Lowcountry, not a Coastal Air Plus quote.
Equipment prices rose roughly 8 to 10 percent when the industry moved to the A2L refrigerants, and that is the market price now rather than a surcharge anyone should be adding to a bid. The defrost board and reversing valve rows never appear on an air conditioner estimate, because a cooling-only system does not have those parts. Where timing rather than the decision is the problem, we offer financing options.
Typical Heat Pump Repair Costs
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.
The Old Village Historic District
- Short Answer: Properties in the Old Village Historic District go through the Old Village Historic District Commission before the Town issues building permits. Exterior work is what draws review, and where an outdoor unit sits and whether it is screened is exterior work.
The Commission's concern is what the street sees. Equipment tucked behind the house, screened, and kept off primary elevations is the path of least resistance. Moving a condenser to a new spot on a visible side of a historic home is the kind of change that turns a two-week job into a longer one.
If your house is in the Old Village and the replacement keeps the equipment where it already sits, say so early. Creating Lasting Relationships has been this company's line since 1947, and the working version of it in this district is asking the screening question before the crew shows up rather than after.
Frequently Asked Heat Pump Repair Questions
Does my HOA need to approve where the outdoor unit goes?
- Often, yes, and it is separate from anything the Town requires. A good number of Mount Pleasant neighborhoods have an architectural review committee with its own rules on equipment placement, screening, and fencing. Replacing a unit in the same location rarely raises an issue. Moving it, adding a second one, or putting a mini-split head on a visible wall usually does. Check the covenants before you commit to a location, because the association is not bound by the Town's decision either way.
Will a new heat pump need an electrical panel upgrade?
- Sometimes. Newer equipment is often gentler on startup than what it replaces, so capacity is not automatically the issue. What does come up is a panel that is already full, aluminum branch wiring, or a breaker sized for equipment that no longer exists. We check the electrical side during the estimate rather than treating it as a surprise on install day.
If I just bought the house, is the heat pump still under warranty?
- Possibly, and it is worth finding out before you pay for a repair. Manufacturer parts warranties usually run five to ten years but often require registration within a set window after the original installation, and many are transferable to a second owner only if the transfer is filed. Labor warranties from the installing contractor are typically shorter and frequently do not transfer at all. Give us the model and serial numbers off the outdoor unit and we can tell you where you stand.
Would a whole-house dehumidifier help more than a bigger heat pump?
- In a lot of Mount Pleasant homes, yes. Oversizing a heat pump to fight humidity backfires: a larger system reaches the set temperature faster, runs shorter cycles, and removes less moisture, so the house ends up cold and clammy instead of comfortable. A properly sized system paired with a whole-house dehumidifier handles the moisture directly and usually costs less than the next size up in equipment.
What paperwork should I have when the job is finished?
- Four things. The closed permit with the passed inspection, the AHRI certificate for the matched system, the manufacturer warranty registration in your name, and the rebate application submitted inside its window. Homeowners rarely ask for any of it, and it is the packet that matters two years later when something fails or you sell. We would rather treat them right for the long term than hand over a receipt and drive off, which is also what a VIP Maintenance Club plan is for.
Where we work in Mount Pleasant
We cover Mount Pleasant from the Old Village and Shem Creek out through the Coleman and Johnnie Dodds corridor to Park West and Carolina Park. What we recommend shifts across that span, because a 1940s cottage near the harbor and a 2019 build off Highway 17 are not carrying the same equipment, the same ductwork, or the same salt exposure. Not better - just different is how we usually put it, and on this peninsula the difference is measurable at the coil.
Mount Pleasant sits in Charleston County, and the full range of what we handle here is on our Mount Pleasant service page. For how heat pumps work and what the efficiency ratings mean, start with our heat pump repair and replacement guide. Twice-yearly service is what keeps a coastal system honest, and our maintenance and tune-up service covers both sides of the year.
