Minnesota requires HVAC technicians to hold a state license before working independently. The path runs through a registered apprenticeship, a state-administered exam, and an application to the Department of Labor and Industry (DLI). There are no work-arounds — but the path is well-defined once you know what you're working toward.
This guide covers the three main license types, what training looks like, how the PSI exam works, how to apply, and what the fees are.
HVAC License Types in Minnesota
Minnesota licenses HVAC work at three levels. Here's how they stack up:
| License Type | What It Covers | Prerequisites |
|---|---|---|
| Journeyman HVAC Technician | Installation, repair, and maintenance of HVAC systems under supervision | 4-year apprenticeship completion |
| Master HVAC Refrigeration Technician | Unlimited HVAC work, including design and supervision of others | 2+ years as a Journeyman + additional exam |
| HVAC Contractor | Business operation of HVAC services; required to pull permits | Master license + business registration |
Most HVAC technicians start as Journeyman licensees. The Master and Contractor licenses are natural next steps that most people pursue after a few years of field experience.
Education & Experience Prerequisites
Minnesota does not allow HVAC work without documented training. The prerequisite for a Journeyman HVAC license is completion of a DLI-registered apprenticeship program.
- Apprenticeship length: 4 years (approximately 8,000 hours of on-the-job training)
- Classroom hours: Typically 576+ hours of related technical instruction over the program duration
- Registration: Apprenticeships must be registered with the DLI. Non-registered programs do not satisfy the licensing requirement.
- Sponsored programs: Many apprentices are sponsored by their employer. Some attend through technical colleges that coordinate with industry partners.
There are no minimum education requirements entering the apprenticeship — a high school diploma or GED is typically expected, but the field values hands-on mechanical aptitude. Related construction or mechanical experience can sometimes be substituted for portions of the apprenticeship hours; confirm eligibility with the DLI before assuming.
Exam Requirements
After completing your apprenticeship, you must pass a state exam before applying for your Journeyman license. The exam is administered by PSI Exams under contract with the DLI.
- Content: Covers the Minnesota Mechanical Code, HVAC theory, installation practices, safety, and refrigeration. Questions are based on code references that change as Minnesota updates its mechanical codes.
- Format: Computer-based, multiple choice
- Passing score: Typically 70% or higher
- Reference materials: The exam is open-book on specific code references — know your Minnesota Mechanical Code book before test day. PSI provides an exam outline at registration.
- Scheduling: Register directly through dli.mn.gov
First-time pass rates are lower than many candidates expect. Plan to spend at least 4–6 weeks studying the Minnesota Mechanical Code specifically. General HVAC trade exam prep books are useful but not sufficient on their own.
Application Process
Once you've passed the PSI exam, apply through the DLI's online licensing portal:
- Go to dli.mn.gov and navigate to the HVAC licensing section
- Create or log in to your DLI account
- Complete the application — you'll need to upload your apprenticeship completion certificate, your PSI exam score report, and any relevant work experience documentation
- Pay the application fee online
- Wait for DLI processing — typically 5–10 business days for complete applications
- Download your license certificate once approved and verify your active status in the DLI database
Your active license will appear in the DLI database within 24 hours of issuance. You can verify it at any time:
Verify a Minnesota HVAC license →
License Fees
Fees are set by the DLI. Confirm current amounts at dli.mn.gov before applying:
| Fee Type | Approximate Amount | Notes |
|---|---|---|
| Journeyman HVAC initial application | ~$60 | Confirm at dli.mn.gov |
| Master HVAC initial application | ~$80 | Confirm at dli.mn.gov |
| PSI Journeyman exam fee | ~$85–$105 | Paid directly to PSI Exams |
| PSI Master exam fee | ~$100–$130 | Paid directly to PSI Exams |
| License renewal (every 2 years) | Verify at dli.mn.gov | Renewal required biennially |
The total out-of-pocket cost for a Journeyman license (exam + application) is typically under $200. The larger investment is the 4-year apprenticeship — plan for those years before you're exam-eligible.
Common Application Mistakes
These are the most common reasons first-time applicants face delays or rejections:
- Applying before your exam results are official — The DLI needs your official PSI score on record. Submitting your application the same day you test is premature — wait for the written confirmation.
- Non-registered apprenticeship hours — Your training program must be DLI-registered. Hours from non-registered programs won't satisfy the prerequisite. Confirm your program's registration status before you start.
- Using the wrong code edition — The exam and application references specific Minnesota Mechanical Code editions. Using an outdated code book for exam prep is a common, costly mistake.
- Missing work history documentation — If you're counting prior HVAC work experience toward a Master license application, you need employer letters or payroll records — not just your own attestation.
- Not verifying your status after approval — DLI processing errors happen. Once you receive approval, search your license in the DLI database to confirm your status shows as Active before you start working:
Search Minnesota HVAC license records →
After You're Licensed
Your Minnesota HVAC license is valid for 2 years and requires renewal. The DLI sends renewal notices, but a mailing delay or address change can leave you working with an expired license — the notice is not a substitute for your own tracking system.
Our monitoring service checks your license status daily and sends email alerts at 90, 60, and 30 days before expiration — so you always know where you stand.
Monitor your HVAC license for $29/mo — expiration alerts, status change notifications, and instant access to your full DLI record.
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