Guide · Updated 2026-10-30
Michigan HVAC Equipment exam guide
Practice for the Michigan HVAC Equipment mechanical contractor exam. PSI says this exam includes ductwork and gas piping, so our bank adds the ductwork topics to heating, cooling, combustion air, fuel gas, heat pumps, and ventilation.
The format
- 150 questions
- 180 minutes
- 75% to pass
- Open book LARA reference list
- Exam fee: $100 (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)
| 6% | 9 | 12 |
HVAC principles and load calculation
| 12% | 18 | 22 |
Equipment installation, access, and clearances
| 12% | 18 | 22 |
Combustion air and venting
| 12% | 18 | 22 |
Fuel gas piping (incl. CSST)
| 12% | 18 | 22 |
Heat pumps, refrigerant handling, and condensate
| 8% | 12 | 14 |
Ventilation and exhaust rates
| 5% | 8 | 10 |
Ductwork: construction and materials (ductwork)
| 7% | 11 | 13 |
Ductwork: installation, support, sealing, insulation (ductwork)
| 6% | 9 | 10 |
Ductwork: design and sizing (ductwork)
| 6% | 9 | 11 |
Ductwork: plenums, dampers, smoke detection (ductwork)
| 5% | 7 | 10 |
Ductwork: exhaust systems (ductwork)
| 5% | 7 | 11 |
Ductwork: chimneys and vents (ductwork)
| 4% | 6 | 9 |
A study plan
- Get comfortable in the 2021 Michigan Mechanical Code and fuel gas code: appliance installation, combustion air, venting, and gas pipe sizing tables.
- Practice combustion air and gas pipe sizing calculations.
- Review duct construction, clearances, and exhaust rules (they’re included).
- Know heat pump and refrigerant basics.
- Do full 150-question timed mocks. Stamina matters.
Try 10 free HVAC Equipment questions HVAC Equipment 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 HVAC Equipment exam?
PSI’s bulletin lists 150 questions in 180 minutes, open book, with 75% to pass.
Does HVAC Equipment include ductwork?
Yes. PSI lists it as “HVAC Equipment (includes ductwork and gas piping).”
What does it cost?
PSI lists $100 for HVAC Equipment.
MI Trade Prep is an independent study tool, not affiliated with LARA or PSI.