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How to verify HVAC contractor licenses, in any state

Verify HVAC contractor licenses — status, expiration, and disciplinary history — across 7 states through one normalized API. Pick a state below, or call /verify with the state, license number, and trade=hvac.

States where we verify HVAC contractor licenses

City-level HVAC contractor licensing

Some HVAC contractor licenses are issued by the city, not the state board. We cover these municipal boards under the same normalized schema:

One call. The whole picture.

The /verify response is identical in shape across every state, so your integration code never changes per jurisdiction:

{
  "valid": true,
  "name": "SAMPLE CONTRACTING LLC",
  "license_number": "SAMPLE-12345",
  "trade": "hvac",
  "expiration": "05/12/2027",
  "status": "Active",
  "state": "AL",
  "disciplinary_actions": [],
  "source_url": "https://genconbd.alabama.gov/database-sql/roster.aspx",
  "cached": false,
  "checked_at": "2026-06-22T05:14:00Z"
}

Example response showing the normalized schema. Wire it up against deterministic fixtures in the sandbox — no credit cost.

Frequently asked questions

How do I verify HVAC Contractor licenses?

Call TradesAPI's GET /verify with the state, license number, and trade=hvac to get a normalized result — valid/invalid, status, expiration, and any disciplinary actions — in one request. The same call works across all 7 covered jurisdictions.

Which states can I verify HVAC Contractor licenses in?

TradesAPI verifies HVAC contractor licenses in 7 states today: Alabama, Connecticut, Kentucky, Maryland, South Carolina, Texas, West Virginia.

Is HVAC Contractor license data free to check?

Each state board's public portal is free to search by hand. TradesAPI adds one normalized API across every covered state — every new API key includes 50 free verifications.