Registered HVAC technician apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits California's license ladder. Updated nightly.
California has 1,597 registered HVAC technician apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 44 counties, 0.4 per 10,000 residents. That is 4.5 apprentices for every 100 employed HVAC technicians in the state, the rate at which the trade is training its own replacements.
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Registered HVAC technician apprentices by county of the apprentice, largest first. Each county links to its HVAC technicians market page.
| County | Apprentices | Share | Per 10k residents |
|---|---|---|---|
| Los Angeles County | 260 | 16% | 0.3 |
| Santa Clara County | 150 | 9% | 0.8 |
| Sacramento County | 140 | 9% | 0.9 |
| Contra Costa County | 136 | 9% | 1.2 |
| Alameda County | 100 | 6% | 0.6 |
| Orange County | 100 | 6% | 0.3 |
| San Bernardino County | 77 | 5% | 0.4 |
| San Joaquin County | 70 | 4% | 0.9 |
| Riverside County | 60 | 4% | 0.2 |
| Sonoma County | 58 | 4% | 1.2 |
| Fresno County | 49 | 3% | 0.5 |
| San Mateo County | 42 | 3% | 0.6 |
| Placer County | 41 | 3% | 1.0 |
| Solano County | 32 | 2% | 0.7 |
| Stanislaus County | 31 | 2% | 0.6 |
| 29 other counties | 251 | 16% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The California register ATI reads carries no separate apprentice-tier credential for HVAC technicians; its ladder for this trade starts at Journeyman (3,029 active records, read October 6, 2026). Registered apprentices in the county table above are counted from the federal apprenticeship system, not from the license register.
Credential types the California Contractors State License Board (CSLB) issues for this trade: C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor. See how to get a HVAC technician license in California for hours, exams and renewal.
Sources: registered apprentices: DOL RAPIDS apprenticeship FY2025, active status, as of December 31, 2025; employment: BLS QCEW construction x OEWS occupation share (estimate); license tiers: California register read October 6, 2026; population: U.S. Census 2023 estimates.
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