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HVAC Guides for Charleston Homeowners

Plain answers on costs, breakdowns and what Lowcountry weather does to a heating and cooling system.

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These guides answer the questions we hear most around Charleston. Some are for the moment something goes wrong, like an AC that quit in a heat wave or a furnace that smells of gas. Others help you plan: what a repair should cost, when an old unit stops being worth fixing, and which rebates are worth checking.

We write them for this climate, with its salt air, long summers and flood zones. Prices quoted in a guide come from named third parties and are not our prices. If a guide does not cover your problem, call us and ask.

Emergency guides

Raised Mount Pleasant style home at dusk on a cold winter evening with porch light on

No Heat at Night

Safe checks for no heat, plus what never to do on a cold night.

Quiet James Island street at dusk with a raised home and a safe distance from the front door

Smell Gas Near a Furnace

Leave first, call from outside, and only then think about the furnace.

Homeowner's outdoor condenser sitting still beside a North Charleston brick ranch on a hazy, hot afternoon

AC Out in a Heat Wave

Four safe checks, when to shut it off, and how to stay cool meanwhile.

Cost and insurance

Condenser on a raised platform behind an elevated Folly Beach home after a passing storm

Home Insurance and HVAC

What standard policies usually cover, what they exclude and why flood is separate.

New gas furnace in a clean utility closet of a Hanahan area home with fresh sheet metal plenum

Furnace Replacement Cost

Dated furnace cost ranges, plus the extras that change a Charleston quote.

Homeowner's kitchen table with a repair quote, a worn AC capacitor and reading glasses near Charleston

AC Repair Cost in Charleston

Homeowner-reported 2026 repair ranges and what makes a quote go up.

New heat pump beside a coastal South Carolina home with a sandy yard and clear morning sky

SC HVAC Rebates and Credits

Which rebates exist as of October 2026, and what to confirm before buying.

Problem solving

New vinyl-sided home on Johns Island style lot on a gray winter morning

Furnace Blowing Cold Air

Four quick checks, then a pattern table for the causes behind cold vents.

White return air grille on a bright wall in a Sullivan's Island style beach cottage

Is Duct Cleaning Worth It

What the EPA says, when cleaning helps and when it does not.

Silver flexible ducts running beneath a raised Folly Beach style house on pilings

Signs of Leaky Ducts

High bills, stubborn rooms and dust can all point back to your ducts.

Ceiling supply vent in a sunlit James Island style living room on a hot afternoon

AC Blowing Warm Air

Seven reasons for warm vents, and which ones you can settle yourself.

Ice-coated heat pump beside a brick ranch on a foggy Hanahan style winter morning

Heat Pump Freezing Up

Frost is normal, solid ice is not. Here is how to tell.

Local angles

Long narrow historic Charleston style house with a side piazza and a shaded garden

Cooling a Single House

Cooling a one-room-wide house without harming plaster, trim or the piazza.

Raised Lowcountry home on piers with an outdoor AC unit on a platform above a sandy lot

Elevated Homes and Flood Zones

How to find your flood rule and set HVAC equipment at the right height.

Dark storm clouds building over a Lowcountry neighborhood with palmettos bending in the wind

Hurricane Prep for Your AC

What to do to your AC before, during and after a hurricane.

Outdoor AC condenser beside a raised coastal Lowcountry home with marsh grass behind it

Salt Air and AC Lifespan

What published lifespan ranges really say, and how to read your own coil.

Hazy summer morning outside a Summerville style brick ranch home with window condensation

Humid House With the AC On

Why a cool house can still feel sticky, and how to find the cause.

Prevention checklists

Raised James Island style home beside golden fall marsh at sunset

Fall Furnace Checklist

Eight safe fall steps and a firm line around gas and combustion.

Clean pleated HVAC air filter resting near a wall return grille in a bright hallway

How Often to Change a Filter

A simple filter schedule by filter type, pets, dust and run hours.

Outdoor AC unit beside a Mount Pleasant style raised home with spring azaleas in bloom

Spring AC Checklist

Eight safe spring jobs, plus the ones to leave for a technician.

Commercial and property managers

Rooftop package units on a low commercial building in the Charleston area under a clear morning sky

Property Manager HVAC Checklist

A month-by-month HVAC task list for managers looking after several buildings.

Crane lifting a rooftop HVAC unit above a low coastal commercial building at sunrise

Rooftop Unit Replacement Planning

Curbs, cranes, tenant notices and permits to settle before you order equipment.

Comparison and decision guides

Ductless wall unit above a window in a bright room of a Ladson area home

Mini Split vs Central Air

A fair comparison of ductless and central systems for homes and additions.

Heat pump outdoor unit beside a Summerville home on a cool clear morning under live oaks

Heat Pump vs Furnace

A side-by-side look at heat pumps and furnaces for mild Lowcountry winters.

Homeowner reviewing a written HVAC quote on a porch of a Charleston area home

Choosing an HVAC Contractor

Six checks to run on any HVAC contractor before you sign a quote.

Aging condenser beside a brick home in Goose Creek with faded cabinet panels in the afternoon sun

Repair or Replace Your AC

How to weigh a big AC repair against a new system, without a guess.

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