The Charleston Lowcountry and York County on the South Carolina side of the Charlotte metro, across Berkeley, Charleston, Colleton, Dorchester, Lancaster and York counties. Each town below has its own permit authority and its own housing stock, and both change what the work involves.
Air conditioning, heat pumps and the humidity that decides whether a Lowcountry house is actually comfortable.
Charleston County · City of Charleston
Charleston County · Town of Mount Pleasant
Charleston County · City of North Charleston
Dorchester County · Town of Summerville
Berkeley County · City of Goose Creek
Charleston County · Charleston County
Charleston County · City of Charleston
Berkeley County · Town of Moncks Corner
Berkeley County · City of Hanahan
Berkeley County · Charleston / Berkeley / Dorchester
Berkeley County · City of Charleston
Charleston County · Charleston County
Charleston County · Town of Mount Pleasant
Charleston County · Town of Seabrook Island
Charleston County · Town of Kiawah Island
Colleton County · Colleton County
Charleston County · Charleston County
York County · City of Rock Hill
York County · Town of Fort Mill
York County · City of Tega Cay
York County · York County
York County · Town of Clover
York County · City of York
Lancaster County · Lancaster County
Heating and air is the division where the two markets diverge most in design. On the coast the system is a humidity machine that also cools: it needs sustained runtime for moisture to condense on the coil and drain away, which is why oversizing produces a house that is cold and clammy rather than comfortable. Salt in the air is a real factor on the barrier islands and along the marsh, where outdoor coils and cabinets corrode faster than they do inland.
In the York County towns the cooling season is still long but the heating side carries more weight, which shifts the balance of a heat pump selection and the value of a backup heat source. What does not change between the two is duct location: a run through an unconditioned attic or a vented crawl space is losing capacity before it reaches a room, and that is true in Rock Hill as much as in Mount Pleasant.
Mechanical replacement is permitted work. The permit is pulled by the licensed mechanical contractor doing the installation, in their own name, from the building department with jurisdiction over the address.
Between them, the towns above fall under 19 separate permit authorities.
In the Lowcountry, permits come from the City of Charleston for Charleston, West Ashley and Daniel Island, the Town of Mount Pleasant for Mount Pleasant and Park West, the City of North Charleston for North Charleston, the Town of Summerville for Summerville, the City of Goose Creek for Goose Creek, Charleston County for James Island, Johns Island and Ravenel, the Town of Moncks Corner for Moncks Corner, the City of Hanahan for Hanahan, Ladson falling to Charleston, Berkeley or Dorchester County depending on the address, the Town of Seabrook Island for Seabrook Island, the Town of Kiawah Island for Kiawah Island and Colleton County for Edisto Island.
In York and Lancaster counties, from the City of Rock Hill for Rock Hill, the Town of Fort Mill for Fort Mill, the City of Tega Cay for Tega Cay, York County for Lake Wylie, the Town of Clover for Clover, the City of York for York and Lancaster County for Indian Land.
A postal town and a jurisdiction are not always the same thing, and on a mechanical replacement the office you are dealing with is the one whose inspector signs off the installation.
Ask to see it on any system replacement. An installation with no permit is one an insurer can ask questions about later, and the inspection is the only independent check that the equipment was fitted the way it was sold.
Yes. The calculation is the same method, the inputs are not — humidity load, orientation and the length of the heating season all move the answer.
A quote produced from square footage alone is not a design in either market.
Noticeably, and it is a function of distance from the water rather than of the town name.
Coil coatings and periodic freshwater rinsing extend equipment life meaningfully on the islands and along the marsh, and are largely unnecessary further inland.
The licensed mechanical subcontractor, from the authority listed against your town above.
We confirm which office that is against the address, because a postal town and a jurisdiction are not always the same thing.