AC Replacement Cost in York County, SC

The short answer

There is no single price, and no quote on this page comes from a York County installer. Two national sources we checked in October 2026 give the band: Trane's 2026 guide says replacing a central AC unit can cost from $3,900 for a basic unit to $13,500 on the high end, with its own units averaging $6,958 to $13,418 installed. This Old House (updated June 2026) puts a 2,000-square-foot home with a 14.3 SEER2 air conditioner and gas furnace at about $8,283, with a low of $5,634 and a high of $14,686. Use those numbers to spot a quote that is far outside the band, not as a budget: the house, the equipment and local labor move the price.

What drives the cost

• System size. Capacity is measured in tons and should come from a load calculation (ACCA Manual J), not from square footage alone. This Old House's example home of 2,000 square feet typically needs about a 3.5-ton system. Bigger is not better: an oversized unit short-cycles and removes less humidity.
• Efficiency (SEER2). For the Southeast region, which includes South Carolina, the federal minimum for split-system air conditioners under 45,000 BTU/h is 14.3 SEER2, and 13.8 SEER2 at 45,000 BTU/h and above, enforced by the date of installation (AHRI). Higher SEER2, two-stage and variable-speed units cost more up front and use less power in a long cooling season. In This Old House's table the 16.1 SEER2 tier averages $10,573 against $8,283 for 14.3 SEER2.
• Refrigerant. Since January 1, 2025, manufacturers may not make or import residential and light commercial air conditioners and heat pumps that use refrigerants above a 700 GWP limit (EPA). That rules out R-410A in new systems; the replacements are lower-GWP refrigerants such as R-454B and R-32. Existing R-410A systems can still be serviced. Ask which refrigerant the quoted unit uses and whether the price includes a new line set.
• Ductwork. Leaky, undersized or crushed ducts waste the efficiency you are paying for. This Old House lists ductwork replacement as an add-on at $1,500 to $3,000. A good installer tests or at least inspects the ducts before quoting.
• Electrical and site work. A new disconnect, breaker or wiring, the pad, the drain line and the thermostat all show up as line items.
• Permits and inspection. York County Permit Services says a permit is required to install, alter or replace mechanical systems, and that all contractors must be licensed through SC LLR. Permit fees are set in the county's residential fee chart; inside town limits the town's building department applies. Ask who pulls the permit.
• Furnace or air handler. Replacing the indoor unit at the same time costs more now and usually less than two separate jobs. Ask for the price both ways.
• Brand, warranty and installer. Premium brands cost more than builder-grade ones, longer labor warranties cost more, and two licensed installers can quote the same job differently. Installation quality matters more to how the system performs than the name on the box.

How to compare quotes

1. Get at least two written quotes for the same scope: model numbers for the outdoor and indoor units, SEER2, tonnage, refrigerant, line set, thermostat, ductwork changes, electrical, permit and disposal of the old unit.
2. Ask for the Manual J load calculation and the AHRI certificate for the matched pair.
3. Check the license with the SC LLR licensee lookup and ask for proof of insurance.
4. Compare the labor warranty separately from the manufacturer's parts warranty, and ask who registers it.
5. If financing is offered, compare the total cost with financing against the cash price.
6. Ask what is excluded. Duct repairs, electrical upgrades and a new pad are the usual surprises.

Rebates and tax credits

The federal Energy Efficient Home Improvement Credit (section 25C) covered qualifying central air conditioners and heat pumps placed in service through December 31, 2025 (IRS). A system installed in 2026 does not qualify for it. Ask the installer and your electric utility about any current rebates; we do not track them here.

AC replacement by town

AC replacement in Rock Hill · AC replacement in Fort Mill · AC replacement in Tega Cay. For a repair instead, every town page lists the companies with hours and phone numbers.

Sources (checked October 29, 2026)

• Trane, “What does Central AC Replacement Cost?” (2026)
• This Old House, “Air Conditioner Cost for a 2,000-Square-Foot Home” (updated June 9, 2026)
• AHRI, “Residential Central Air Conditioners” (2023 regional efficiency standards)
• U.S. EPA, HFC restrictions by sector (Technology Transitions)
• IRS, Energy Efficient Home Improvement Credit (section 25C)
• York County, SC, Residential Permits
• SC LLR, Residential Builders Commission (HVAC Installer and Repairer license, licensee lookup)