South Carolina HVAC License Requirements — Complete Checklist for Both Boards

Two Boards, Two Requirement Checklists

South Carolina runs two separate licensing boards for HVAC work, and each has its own checklist of prerequisites. Mix them up — submit a residential application to the commercial board, or prepare commercial financials for a residential filing — and you lose your non-refundable fees and restart from zero.

Here is the full requirements breakdown for each track.

Residential RBH License Requirements (Residential Builders Commission)

The Residential Specialty HVAC Installer and Repairer (RBH) license covers residential structures up to three stories and sixteen units. Required for any residential HVAC project exceeding $500 in total cost.

Experience:

• One year of hands-on residential HVAC work within the past five years
• Verified by a licensed builder or HVAC contractor through the Residential HVAC Installer and Repairer Experience Affidavit
• Matching W-2 or 1099 tax records for the claimed employment period — any mismatch between dates on the affidavit and tax forms triggers an audit

Exams (administered by PSI):

• Residential HVAC Trade Exam: 80 questions, 240 minutes, 65% passing score (52 correct)
• Residential Business Management and Law Exam: 50 questions, 120 minutes, 68% passing score (34 correct)
• Both exams are open-book with approved reference texts only

Financial:

• Complete personal credit report from TransUnion, Experian, or Equifax dated within 30 days of application
• $10,000 surety bond required if any project exceeds $5,000 (issued in your personal legal name, not a business entity)

Fees:

• Application fee: $135
• License fee after passing exams: $220
• Exam fees: $100 (trade) + included (law)

Procedural note: The RBC must approve your experience before you can register for exams. Wait for that approval before sitting for the PSI tests.

Commercial Mechanical Contractor Requirements (Contractor's Licensing Board)

The Mechanical Contractor license covers commercial, industrial, and institutional HVAC work. Required for any project exceeding $10,000 in total cost.

Experience (for the Primary Qualifying Party):

• Two years of commercial HVAC experience within the past five years
• Documented via LLR Document 167 (Work Experience Affidavit) describing specific physical tasks performed
• Alternatively, completion of a four-year PHCC Academy of North Carolina apprenticeship satisfies the experience requirement

Exams (administered by PSI):

• Commercial Trade Exam (varies by subclassification — Air Conditioning, Heating, Packaged Equipment, or Refrigeration): 50–80 questions, 180–240 minutes, 70% passing score
• Commercial Business Management and Law Exam: 50 questions, 125 minutes, 70% passing score (35 correct)
• All exams are open-book

Financial (choose one path per group):

Groups 1–2 accept owner-prepared financial statements. Groups 3–5 require CPA-prepared statements on a GAAP basis — but every group allows a 1:1 surety bond in lieu of financial statements.

Fees:

• Initial license application (Doc 165): $350
• Exam fees: $60–$75 per exam

Procedural note: Unlike the residential track, the CLB does not require pre-approval for exam registration. Take and pass your exams first, then submit your complete application package.

Requirements That Apply to Both Tracks

Regardless of which board you file with:

• EPA Section 608 Certification: Federally required for technicians whose work could release regulated refrigerants, subject to federal exceptions such as closely supervised apprentices. It is not a substitute for a state license.
• Business entity registration (if applicable): LLCs and corporations must be formed through the South Carolina Secretary of State ($125 filing fee) before operating under that entity; a sole proprietorship is not required to submit the CLB's entity verification.
• Local business license: Required from each municipality or county where you physically conduct operations. No statewide business operating license exists in South Carolina.
• Liability insurance: While not always mandated at the state application level, local building departments and commercial general contractors typically require $300,000 to $1,000,000 in general liability coverage before issuing permits or awarding contracts.

Common Application Mistakes

The most frequent errors that delay or kill applications:

1. Submitting an expired credit report — the RBC rejects any credit report older than 30 days
2. Issuing the residential bond in a business name — the RBC requires the $10,000 bond in your personal legal name
3. Filing the commercial bond without original signatures — the CLB rejects digital signatures (DocuSign) on surety bonds
4. Mismatched experience dates — any gap between your affidavit dates and tax records triggers a formal audit

For a sequenced walkthrough of both application pipelines — including which documents to prepare first and which agency checkpoints to clear in what order — the South Carolina HVAC License Guide covers the full dual-board filing process.

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