Greenville SC HVAC permit rules
Greenville Community Development requires mechanical permits for all HVAC equipment installations and replacements. Apply at greenvillesc.gov. South Carolina licensed HVAC contractors required — verify at llr.sc.gov. South Carolina does not require HERS testing. Duke Energy serves electricity (1-800-777-9898); Piedmont Natural Gas serves natural gas (1-800-752-7504).
Greenville's CZ3A climate — 18°F heating design, 93°F cooling design — places it in the ideal zone for heat pump economics. The heating load is real (18°F is cold enough that resistance-only heating is expensive) but the design temperature is well within the effective range of standard heat pump models. No cold-climate specification is needed here. The federal minimum efficiency is 15 SEER2 for the South region (effective January 2023); given Greenville's significant cooling season, 18+ SEER2 equipment has a shorter payback period than in northern markets.
Upstate South Carolina's summer humidity — drawn from the Gulf via the Southeast's warm-season pattern — creates meaningful latent load. A variable-speed (inverter-driven) system that runs at lower speeds for longer periods removes more moisture per degree of cooling, producing better comfort than a single-speed unit that cycles rapidly. For Greenville's mixed humid climate, variable-speed is the appropriate specification for both comfort and energy efficiency.
Three Greenville HVAC scenarios
| Factor | What it means for your project |
|---|---|
| Standard HP — no cold-climate spec | 18°F design is within standard HP range. No NEEP ccASHP needed in Greenville. |
| Variable-speed for humidity | Upstate SC humid summers: variable-speed removes more moisture. |
| No HERS testing | SC does not require HERS. |
| Duke Energy + Piedmont Natural Gas | Separate utilities: Duke (electric): 1-800-777-9898. Piedmont (gas): 1-800-752-7504. |
| 15 SEER2 min; 18+ recommended | CZ3A cooling season: higher SEER2 pays back well. |
Phone: (864) 467-4570 | greenvillesc.gov
SC Contractor Licensing: llr.sc.gov (SCLLR)
Duke Energy (electric): 1-800-777-9898 | duke-energy.com
Piedmont Natural Gas: 1-800-752-7504 | piedmontng.com
Common questions about Greenville, SC hvac permits
Do I need a cold-climate heat pump in Greenville SC?
No. Greenville's CZ3A climate has an 18°F heating design temperature — well within the effective range of standard heat pump models. Cold-climate specification (NEEP ccASHP) is not required or cost-effective in Greenville. Standard heat pumps work well here; the more important specification is variable-speed for Upstate SC humidity control.
What HVAC license is required in Greenville SC?
South Carolina requires an SC licensed HVAC contractor through SCLLR (llr.sc.gov). Apply for permits at greenvillesc.gov.
Information based on Greenville, SC official sources and applicable state/local building codes as of April 2026. Codes and fees change — verify current requirements before starting work. For a project-specific report, use our permit research tool.