Registered HVAC technician apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Illinois's licence ladder. Updated nightly.
Illinois has 354 registered HVAC technician apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 56 counties, 0.3 per 10,000 residents. That is 3.9 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 |
|---|---|---|---|
| Cook County | 34 | 10% | 0.1 |
| Rock Island County | 28 | 8% | 2.0 |
| Tazewell County | 22 | 6% | 1.7 |
| St. Clair County | 20 | 6% | 0.8 |
| Sangamon County | 17 | 5% | 0.9 |
| Peoria County | 16 | 5% | 0.9 |
| DuPage County | 15 | 4% | 0.2 |
| Madison County | 15 | 4% | 0.6 |
| Will County | 14 | 4% | 0.2 |
| Knox County | 12 | 3% | 2.5 |
| Henry County | 11 | 3% | 2.3 |
| Kane County | 11 | 3% | 0.2 |
| Winnebago County | 11 | 3% | 0.4 |
| Whiteside County | 10 | 3% | 1.8 |
| McHenry County | 9 | 3% | 0.3 |
| 41 other counties | 109 | 31% |
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. The Illinois Department of Financial and Professional Regulation licenses plumbing and roofing at state level but not HVAC; licensing is municipal. issues for this trade: Municipal HVAC or general contractor registration (e.g. Chicago), Federal EPA Section 608 technician certification (refrigerants), No state HVAC licence. See how to get a HVAC technician license in Illinois 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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