Guide · Updated 2026-10-30
Michigan Refrigeration exam guide
Practice for the Michigan Refrigeration mechanical contractor exam: the refrigeration cycle, refrigerant safety and classes, code requirements for machinery rooms, walk-ins, and refrigerant piping.
The format
- 55 questions
- 60 minutes
- 75% to pass
- Open book LARA reference list
- Exam fee: $50 (PSI).
Test-day rules
- Computer-based at PSI test centers, after LARA approves your application.
- Open book: bring unmarked, bound copies of the references LARA lists for this classification.
- Questions on PA 407 (the Skilled Trades Regulation Act) and PA 230 appear on every classification exam.
What’s on it
PSI lists the content areas but not how many questions come from each. Our practice uses these estimated weights:
| Topic | Our estimated weight | In our mock | Bank |
|---|---|---|---|
Michigan law (PA 407 Article 8, PA 230)
| 9% | 5 | 7 |
Refrigeration cycle and principles
| 18% | 10 | 13 |
Refrigerants, ASHRAE 34, and EPA Section 608
| 18% | 10 | 13 |
Mechanical code Chapter 11 and ASHRAE 15
| 18% | 10 | 13 |
Commercial walk-ins, components, and troubleshooting
| 18% | 10 | 13 |
Piping, brazing, evacuation, and charging
| 19% | 10 | 14 |
A study plan
- Master the refrigeration cycle, superheat, and subcooling.
- Learn refrigerant safety groups and machinery room rules in the mechanical code.
- Review walk-in cooler and freezer requirements.
- Study refrigerant piping, testing, and evacuation.
- Take timed mocks.
Try 10 free Refrigeration questions Refrigeration practice page
Sources: PSI Candidate Information Bulletin 5421 (mechanical, effective Aug 20, 2026) · LARA mechanical exam reference materials (PDF). Checked October 30, 2026. Rules and fees change, so confirm with LARA and PSI.
FAQ
How many questions are on the Refrigeration exam?
PSI’s bulletin lists 55 questions in 60 minutes, open book, with 75% to pass.
What does it cost?
PSI lists $50.
MI Trade Prep is an independent study tool, not affiliated with LARA or PSI.