Heat Pump Installation in Charleston, SC

Heat pump installation in Charleston suits the way our climate actually works: a long, humid cooling season, a short winter and only occasional freezes. One system handles both, with no gas line needed. Aero Air Techs sizes it from a load calculation, plans where the outdoor unit will sit and gives you a line-itemed quote before work begins.

Your current system still running? You may only need a heat pump repair. This page is for a new heat pump, whether it replaces an old one or takes over from a furnace and AC.

Is a heat pump the right fit for your home?

For most all-electric Lowcountry homes, yes. In 2023, EIA counted electricity as the heating source for about 71% of South Carolina households, and heat pumps are a common way to do that here. The fit depends on what you have now.

• Old heat pump. Replacing like for like is the simplest path.
• Electric furnace and AC. A heat pump usually costs far less to run in winter, because it moves heat rather than making it.
• Gas furnace and AC. Compare it to a furnace replacement, since gas may stay competitive where the service already exists.
• No ducts. A ductless mini split is a heat pump too, and it suits additions and older homes.

Our post on heat pump vs furnace for South Carolina homes walks through that choice in more detail.

What the rules and ratings mean for a new heat pump

Two numbers matter on the label. SEER2 measures cooling efficiency, and HSPF2 measures heating efficiency, with higher being better on both. DOE's 2023 standards set the southeast minimum for split heat pumps at 14.3 SEER2 and 7.5 HSPF2. Older SEER labels use a different test, so a 14 SEER tag is not the same thing.

New systems also use different refrigerant. From January 1, 2025, EPA's Technology Transitions rule shifted new residential heat pumps off R-410A and toward options such as R-454B and R-32, which have lower global warming potential. Check which one a quote names, and confirm the indoor coil is rated for it. Old refrigerant has to be recovered, not vented, and EPA Section 608 requires certification for anyone who handles it.

Cold climate heat pump or standard model?

Most Charleston homes do not need a cold climate model. Those units are designed to hold output in winters we rarely see, and you pay for that ability. A well-sized standard or variable-speed heat pump with electric backup covers occasional freezes.

Backup is where the planning happens. As it gets colder outside, a heat pump's output falls while the house needs more heat. The temperature where those lines cross is called the balance point, and below it the strips make up the difference. DOE's design guide for building professionals says backup commonly takes over at a set outdoor temperature between 5°F and 35°F, depending on the equipment and the load. That range is general guidance, and your load calculation sets the real number.

Sizing runs on cooling as much as heating. Size a heat pump to the coldest night alone and it can run oversized all summer, which leaves the house clammy. A Manual J load calculation looks at both seasons, and in Charleston the cooling load usually leads.

Variable-speed models earn a look for a different reason. Long, slow runs strip more moisture from the air in July.

Heat pump installation in Charleston: where should the outdoor unit go?

Pick the spot before you pick the unit, since a heat pump sits outside and works in both seasons.

Salt. Near the ocean or marsh, ask about coated coils and shield the unit from direct salt spray where you can. Rinse it on a schedule, because it never gets a season off.

Roof runoff. Keep it out from under a gutterless roof edge. Water dripping on a heat pump in a freeze builds ice fast.

Spacing. Give it room. A DOE design resource notes that heat pumps placed too close together may not be able to defrost properly.

Flood. In A, AE, AH, AO and A99 zones, Charleston County requires replacement HVAC at or above the lower of the existing finished floor or the design flood elevation, and a Substantial Improvement has a stricter limit. Incorporated towns set their own rules, so confirm with your jurisdiction.

Historic districts. The Board of Architectural Review's guidelines for the City of Charleston say HVAC units belong to the rear, screened and hidden from the public right-of-way. That covers the City's districts only, so ask staff before you move or add outdoor equipment.

What a heat pump replacement includes, step by step

Scope first, then sequence. Your quote should spell out the outdoor unit, air handler or coil, heat strip size, thermostat, drain, electrical work and how the permit is handled. Ask for an AHRI certificate so the indoor and outdoor models are shown as a tested pair. Then the work usually goes like this.

1. Protect the work area. We shut down the old system and cover the path.
2. Recover old refrigerant. It goes into a recovery tank, as federal rules expect.
3. Remove old equipment. Outdoor unit, air handler or coil come out.
4. Set the new system. The outdoor unit gets anchored per the manufacturer and local code, and the air handler goes in with its drain.
5. Connect lines and power. Lines get brazed, and electrical connections are made and checked.
6. Pressure test and evacuate. A deep vacuum clears moisture before charging.
7. Commission in both modes. We check charge, airflow, heat strips and defrost settings.
8. Hand it over. You see how the thermostat, filter and emergency heat work.

Your ducts count too. Attic ducts in this area often leak, and heat pump air is gentler than furnace air, so losses show up fast. If yours need work, our duct repair page covers it.

What drives heat pump cost?

Scope and equipment class drive the price more than anything else.

• System type. Full replacement costs more than an outdoor swap, when that is allowed.
• Efficiency. Higher SEER2 and HSPF2 ratings cost more up front.
• Air handler. A switch from a furnace may mean a new air handler and backup strips.
• Electrical. A new circuit or a larger panel can add real cost.
• Coastal and flood needs. Coated coils, raised stands and anchoring all change the job.
• Ducts. Leaks and undersized runs add work.

We quote your house before work begins, and we can price more than one option on the same quote.

Heat pump rebates to check before you buy

The federal credit has ended, so look to utilities next. Section 25C stopped covering property placed in service after December 31, 2025.

• Dominion Energy South Carolina. EnergyWise Shop and aggregators reported in 2026 that its rebates run $400 to $500 toward an ENERGY STAR heat pump, and $650 when a heat pump takes over from an electric furnace. Confirm on Dominion's rebate page.
• Santee Cooper. For its customers, Santee Cooper's home rebate program was reported at $300 to $400 a system. Confirm on Santee Cooper's site.
• HEAR and HOMES. These state programs carry income limits, and the SC Energy Office describes them as still being set up. Check energy.sc.gov/rebates.

Reports also say the equipment goes in first, a licensed contractor has to do the work and you then have 90 days to apply with an invoice. Request a license number from every bidder and check it on the SC LLR site. Our rebate guide has more.

Why ask Aero Air Techs to quote your heat pump?

You should be able to check our work and our numbers.

• 4.9 on Google. Sixteen reviews as of October 2026.
• Warm and cool. One customer's review says "cold and heat work amazing."
• Work explained. Per a different review, the techs "explained everything that needed to be done."
• Clear, upfront quote. You see line items before work begins.

Heat pumps across the Charleston area

Based in Charleston, we quote heat pumps across the surrounding areas, including Johns Island, Hollywood, Summerville and Isle of Palms. Call with your address and what you have now, and we will start from there.

Climate and utility both change the case for a heat pump.

• Johns Island: an all-electric new build is the simple case, with one system for both seasons.

• Hollywood: rural homes often weigh a heat pump against the fuel supply they have.

• Summerville: frost around mid-November makes the 7.5 HSPF2 floor worth reading closely.

• Isle of Palms: coated coils and a raised stand matter more than the heating rating.

• Moncks Corner: Santee Cooper's reported rebate depends on being its customer, so check your bill.

• Awendaw: Berkeley Electric has an office there, so ask your own utility about programs.

• Folly Beach: the outdoor unit counts toward the four-foot freeboard rule.

• Mount Pleasant: two-system homes can change one floor first and compare bills.

• Berkeley County: three different utilities serve parts of the county, so the rebate question comes first.

• Dorchester County: inland freezes make backup heat sizing part of the quote.

• Colleton County: rural homes without gas service often lean on a heat pump and strips.