Find a 24/7 HVAC Technician in Charleston, SC
When your AC or heat fails on the worst day of the year, every hour matters. Connect with an independent local HVAC pro — our phone line is open 24/7.
By Gyanesh Gulshan — Founder, Cool Call Pro
HVAC emergencies in Charleston
Call Now — (844) 582-179524/7 call line · call to check availability in Charleston
AC out, blowing warm, or iced over
Outdoor unit silent · indoor blower running but warm air · ice on the refrigerant lines · short-cycling on/off. Possible causes range from electrical parts (capacitor, contactor) to a refrigerant problem — both need a technician to diagnose.
Furnace not igniting or blowing cold
Furnace won't ignite · blowing cold air · short-cycling · burning smell on first startup. If you smell gas, leave the building right away without flipping switches or using phones inside, then call 911 or your gas utility’s emergency line from outside.
Banging, screaming, or grinding outdoor unit
Loud bangs · metal-on-metal screaming · grinding or rattling from the outdoor unit. Possible causes include a failing fan motor, a loose blower wheel, or worn compressor bearings. Turn the system off at the thermostat and call a technician.
How Cool Call Pro works in Charleston
24/7 Charleston call line
Our phone line is open 24/7. Calls are routed to independent HVAC providers in the Charleston area where one is available; hours, weekend and holiday coverage, and overnight surcharges are set by each provider.
Call to check availability
Provider availability varies by address and time of day, so call to check availability in Charleston. The neighborhoods and ZIPs listed for this page are in the Services & service area section below.
Check licenses yourself
Cool Call Pro does not check contractor licenses or insurance. Verify any contractor’s license with the South Carolina license lookup. South Carolina rules are in the local data section below.
Charleston's mixed-humid climate & your HVAC
This Zone 3A (Warm-Humid) climate splits the year between heating and cooling load. Federal SEER2 14.3 (Southeast Region) minimum applies to new AC equipment. A heat pump handles both heating and cooling from one outdoor unit.
Avg summer high
IECC zone (mixed-humid)
Avg winter low
Federal SEER2 minimum
Days/yr above 90°F
Days/yr below 32°F
Charleston had an estimated 159,423 residents on July 1, 2025. In Charleston, the median home was built in 1994 with a current median value of $469,100. Around 56% of homes are owner-occupied. About 24% of households heat with natural gas vs. 74% electric. The South Carolina grid averages $0.16/kWh. Sources: U.S. Census population estimates · U.S. Census ACS 2019–2023 5-year tables B25035 · B25077 · B25003 · B25040 · U.S. EIA state rates.
Read our guide on heat pump guide.
HVAC in Charleston, SC: local data & sources
Every numerical claim below references a federal, state, or municipal primary source — NOAA climate normals, U.S. Census ACS, the South Carolina licensing authority, and your local utility's published rebate program.
NOAA NCEI 1991–2020 Normals
Charleston International Airport (KCHS) is the official NOAA reference station for Charleston, South Carolina. Per the NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00013880), Charleston records an annual mean temperature of 66.5°F, an average annual maximum of 76.7°F against an annual minimum of 56.4°F, approximately 1,844 annual heating degree days against 2,435 cooling degree days, an annual precipitation normal of 52.51 inches, and an annual snowfall normal of just 0.3 inches. Charleston averages 64.3 days per year above 90°F and only 22.4 days below freezing. The 1.3:1 CDD-to-HDD ratio makes Charleston a cooling-dominant market, with summer latent (humidity) loads the dominant design driver. Charleston also faces meaningful Atlantic hurricane exposure: per the NWS Charleston Tropical Cyclone History, 41 tropical cyclones made landfall in the NWS Charleston area between 1851 and 2018, including four major (Category 3+) storms — the 1893 Great Charleston Hurricane, Hazel (1954), Gracie (1959), and Hugo (1989). Coastal salt-air corrosion shortens the service life of outdoor condenser coils relative to inland markets.
U.S. Census ACS 2023 5-Year
The U.S. Census Bureau ACS 2023 5-year estimates (Tables B25040, B25003, B25077 and B25035 for Charleston city, South Carolina) report 66,408 occupied housing units with a median year built of 1994 — one of the newer median ages among Southeast cities, reflecting decades of Lowcountry growth. Heating-fuel distribution: 74.2% electricity (49,266 units), 23.8% utility natural gas (15,793 units), and 442 units on bottled/tank/LP gas. The 55.6% owner-occupancy rate and median home value of $469,100 reflect Charleston’s high-value coastal housing market. The strong electric majority reflects the modest winter heating load in Zone 3A — heat-pump primary heat handles the 1,844 HDD requirement efficiently without auxiliary fuel. South Carolina’s residential average electricity rate of 16.15¢/kWh (EIA Electric Power Monthly) is moderate by national standards.
South Carolina State Resource
South Carolina regulates HVAC work through two paths. Residential HVAC work is licensed by the South Carolina Residential Builders Commission (Department of Labor, Licensing & Regulation). The Residential HVAC contractor license fee is $220, requires the qualifying party to pass the PSI trade exam plus the SC business and law exam, and requires a $10,000 surety bond if the total cost of any project exceeds $5,000. Licenses renew every two years. Commercial mechanical work is regulated by the South Carolina Contractor’s Licensing Board; the commercial Mechanical Contractor (subclassification HT, AC, etc.) license carries a $350 initial fee, requires two years of work experience, and uses a financial-statement-based group classification rather than a fixed bond amount. Verify a specific Charleston contractor’s current license status on the LLR public lookup before contracting.
U.S. Department of Energy
Charleston’s electric service is provided by Dominion Energy South Carolina, which administers a published residential HVAC rebate program for eligible customers. As of September 2026, Dominion lists $400–$500 toward the purchase and installation of an ENERGY STAR® central air conditioner or heat pump (replacement of existing equipment); $650 when an electric furnace is replaced with an ENERGY STAR® heat pump; and $750 for an ENERGY STAR® certified heat pump water heater. As of September 2026, the South Carolina Energy Office says its federally funded High-Efficiency Electric Home Rebate (HEEHR) program (branded in South Carolina as Home Electrification and Appliance Rebates) and its HOMES program are not yet available, with availability anticipated in 2026. When it opens, HEEHR is limited to households below 150% of county Area Median Income, with up to $14,000 per household. Under DOE Program Notice 26-2 (effective May 29, 2026), HEEHR rebates cover upgrades from existing electric equipment to more efficient electric equipment (and new construction), not the replacement of gas, oil, or propane systems.
The federal Section 25C Energy Efficient Home Improvement Credit was terminated for installations placed in service after Dec 31, 2025 by the One Big Beautiful Bill Act (Public Law 119-21). Check your state energy office and utility for current rebate programs. See our HVAC financing options for what's still available.
Services & service area
Services you can ask about
- Emergency AC Repair in Charleston
- Furnace Repair & Heating Service in Charleston
- Heat Pump Installation & Dual-Fuel Systems
- Central Air Conditioning Installation & Replacement
- HVAC System Maintenance & Seasonal Tune-Ups
Neighborhoods & ZIPs listed for Charleston
- South of Broad
- Mount Pleasant
- James Island
- West Ashley
- Harleston Village
- ZIP codes: 29407, 29412, 29414, 29403, 29406
HVAC repair costs: national ranges for Charleston, SC homeowners
Cool Call Pro editorial estimates of typical U.S. prices from our 2026 cost guide — not quotes and not Charleston-specific. Actual price varies by provider and complexity.
Diagnostic / service call
$65–$150
Some providers credit it toward the repair — ask when you call
Minor AC repair
$75–$500
Capacitor, contactor, thermostat, drain line
Refrigerant recharge
$150–$600
R-410A per recharge; leak fix extra
After-hours surcharge
$100–$300
Added to repair cost on emergency calls
See full repair, install, and replacement ranges in our 2026 HVAC Cost Guide and how we build these ranges →
Ready to talk to an HVAC pro in Charleston?
Independent technicians · 24/7 call line · Verify any contractor’s license with the South Carolina license lookup
Call Now — (844) 582-1795Disclosure: We are a referral service and may receive compensation for qualified calls. Calls may be routed to an independent provider network and may be recorded. Pricing and availability vary by provider and location.
Frequently Asked Questions — Charleston, SC
Yes, ensure your contractor files a mechanical permit with the City of Charleston Permit Center. Pulling the correct permits protects you as a homeowner and ensures work is inspected to code.
Rebate programs for Charleston homeowners are summarized, with sources, in the Local Rebates & Permits card above. Confirm current amounts and eligibility with your utility (Dominion Energy South Carolina) before scheduling work. The federal Section 25C credit was terminated for installations placed in service after Dec 31, 2025 (One Big Beautiful Bill Act, P.L. 119-21); check your state energy office and utility rebate programs instead.
The neighborhoods and ZIP codes listed for Charleston are in the ZIPs & Neighborhoods card above. Provider availability varies by address, so call (844) 582-1795 to check availability in Charleston.
Cool Call Pro’s editorial estimate for a standard AC replacement in Charleston is $3,500–$8,000, and for furnace installations $3,500–$7,000. These are our own estimates, not quotes or survey data — see how we build cost ranges. Costs vary with system size, efficiency rating, and installation complexity. In South Carolina, new AC units must meet a minimum SEER2 14.3 (Southeast Region) rating.
In South Carolina, HVAC contractors should hold this license: SC LLR Residential Builder or Contractor License. Always verify your contractor’s credentials before authorizing work. For Charleston residents, permits are filed through the City of Charleston Permit Center.