Registered HVAC technician apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Missouri's licence ladder. Updated nightly.
Missouri has 516 registered HVAC technician apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 43 counties, 0.8 per 10,000 residents. That is 7.4 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 |
|---|---|---|---|
| St. Louis County | 149 | 29% | 1.5 |
| St. Charles County | 102 | 20% | 2.4 |
| Jefferson County | 72 | 14% | 3.1 |
| Franklin County | 38 | 7% | 3.6 |
| St. Louis city | 24 | 5% | 0.9 |
| Greene County | 17 | 3% | 0.6 |
| Lincoln County | 16 | 3% | 2.5 |
| Jackson County | 14 | 3% | 0.2 |
| Cole County | 10 | 2% | 1.3 |
| Warren County | 9 | 2% | 2.4 |
| Boone County | 7 | 1% | 0.4 |
| St. Francois County | 6 | 1% | 0.9 |
| Pulaski County | 5 | 1% | 0.9 |
| Washington County | 4 | 1% | 1.7 |
| Callaway County | 3 | 1% | 0.7 |
| 28 other counties | 40 | 8% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
Credential types the No statewide HVAC licence and no state mechanical board. Licensing is municipal; Missouri's only statewide construction-trade licence is the OPTIONAL electrical contractor licence. issues for this trade: Municipal HVAC or mechanical contractor licences (e.g. Kansas City, St. Louis), Federal EPA Section 608 technician certification, No state HVAC licence. See how to get a HVAC technician license in Missouri 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); population: U.S. Census 2023 estimates.
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