Registered HVAC technician apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Iowa's licence ladder. Updated nightly.
Iowa has 972 registered HVAC technician apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 83 counties, 3.0 per 10,000 residents. That is 25.5 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 |
|---|---|---|---|
| Polk County | 178 | 18% | 3.5 |
| Linn County | 95 | 10% | 4.1 |
| Woodbury County | 69 | 7% | 6.5 |
| Johnson County | 46 | 5% | 2.9 |
| Scott County | 40 | 4% | 2.3 |
| Black Hawk County | 35 | 4% | 2.7 |
| Dubuque County | 35 | 4% | 3.5 |
| Story County | 30 | 3% | 3.0 |
| Dallas County | 26 | 3% | 2.3 |
| Warren County | 18 | 2% | 3.3 |
| Muscatine County | 17 | 2% | 4.0 |
| Jones County | 15 | 2% | 7.2 |
| Marion County | 14 | 1% | 4.1 |
| Washington County | 14 | 1% | 6.2 |
| Benton County | 13 | 1% | 5.0 |
| 68 other counties | 327 | 34% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The Iowa register ATI reads carries no separate apprentice-tier credential for HVAC technicians; its ladder for this trade starts at Journeyman (6,194 active records, read September 16, 2026). Registered apprentices in the county table above are counted from the federal apprenticeship system, not from the licence register.
Credential types the Iowa Plumbing and Mechanical Systems Board, Iowa Department of Inspections, Appeals and Licensing issues for this trade: Apprentice, Journeyperson (HVAC-refrigeration, hydronic, sheet metal, mechanical disciplines), Master (HVAC-refrigeration, hydronic, mechanical disciplines), Contractor, Specialty licenses, Medical gas piping installation certification. See how to get a HVAC technician license in Iowa 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); licence tiers: Iowa register read September 16, 2026; population: U.S. Census 2023 estimates.
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