Heating and Cooling in Mount Pleasant, SC

Heating and cooling in Mount Pleasant often means two systems under one roof, with salt air working on both condensers. Aero Air Techs is based in Charleston, about 25 minutes by road from most of town, and we cover homes and small businesses here. Traffic on the Ravenel Bridge and US 17 can stretch that, so we talk timing on the phone.

Size is what sets this town apart. The Census counted 30,108 people in 1990 and 90,801 in 2020, and the town held 40,680 housing units by then. That is a lot of newer, larger homes, plus a historic village at the harbor end.

Heating and cooling in Mount Pleasant, floor by floor

Treat each system as its own machine. A large two-story house commonly runs one unit for the first floor and another for the second, and the upper air handler often sits in the attic. They do not wear evenly. The upstairs system fights roof heat all afternoon, so it runs longer and tends to show trouble first.

Here is where the calls usually land:

• AC repair when one floor goes warm and the other holds. We test the failing side on its own before anyone talks about replacing both.
• Coastal corrosion AC repair for coils and cabinets that sit in the breeze off Shem Creek or the harbor. Homes at the Old Village end take more salt than those far out along US 17.
• AC maintenance with a coil rinse on each condenser, since two units means two sets of drains, contactors and capacitors.
• Thermostat installation when two zones argue, or a smart thermostat needs checking against the wiring. Two systems under one roof can fight each other, and the upstairs unit usually pays for it.
• Duct repair for attic runs that pulled loose or lost insulation. An upstairs air handler in the attic means those ducts sit in roof heat all afternoon, so a small tear costs more here.
• Ductless mini splits for bonus rooms over garages and older rooms with no route for ducts. One head can settle a hot bonus room without asking more from a system that is already working hard.

From the Old Village to the far end of US 17

Start with where the house sits on the map, because this town spans several building eras. The Old Village is the oldest neighborhood. Its Hibben House dates to 1755, and local histories describe the original town as laid out in 1803, bounded by Shem Creek, Cove Inlet and the harbor.

Those houses were never planned around central air. Ducts arrived later or not at all, so airflow and routing come first in any quote. Keep the rooms in mind too: old plaster and tight framing limit where a return can go.

Head northeast and the story flips. Town limits follow US 17 most of the way to Awendaw, and the town added more than 17,000 people in the 1990s alone. Plenty of those houses are on their second system by now, and some are still on the first. Either way, sizing deserves a fresh look. A Manual J load calculation, which works out heat gain room by room, tells you whether the old unit was ever the right size.

How do you spot salt damage near Shem Creek and the harbor?

Check the fins before you check the rating. Salt settles on the condenser coil, holds moisture against the aluminum and eats the metal from the outside. Exposure drops as you move inland, but water wraps much of this town: Shem Creek, the Cooper River at Patriots Point and the Wando on the far side.

What to look for:

1. White powder on the fins or at the coil edges.
2. Fins that crumble when touched.
3. Rust at cabinet screws and the base pan.
4. Green or chalky electrical contacts inside the service panel.

A fresh-water rinse slows all of that. If a coil is already failing, ask about coil coating on the replacement and compare the cost with the years of exposure ahead.

Ann Edwards Lane, flood rules and the 50 percent test

Flood questions go to the Town and not the county. The Building Inspection Division works from 100 Ann Edwards Lane, and Town guidance points freeboard and flood-resistant materials questions there.

Two rules are worth knowing before a big job. The Post and Courier reports that older buildings must meet current code when renovations pass 50 percent of the building's value. Town guidance also says a substantially damaged building must be repaired to new-construction standards, elevation included. A storm-damaged condenser on a low lot may fall into a bigger conversation than a swap, so ask first.

What happens when you call from east of the Ravenel Bridge?

You get questions first, then a plan.

1. Tell us the address and which floor or system is acting up. Patriots Point and a home up US 17 past Boone Hall are very different drives.
2. Talk through timing. We are open around the clock, but bridge traffic decides a lot, so we do not read you a map estimate as an arrival time.
3. We test each system separately. Pressures, airflow, drainage and electrical readings, one unit at a time.
4. You get a clear, upfront quote. We quote before work begins, and each system is listed separately if both need attention.

Check your power bill before you price new equipment. If Dominion Energy is on it, look at Dominion's rebate page and confirm the terms before equipment goes in. Nearby, salt exposure climbs fast on Sullivan's Island, and the rest of the map is on our service areas page.