Michigan LARA license exam · given by PSI
Limited Heating Service practice test
Practice for the Michigan Limited Heating Service exam: combustion, ignition systems, controls, furnaces, boilers, and venting. (75 questions total: 10 free + 65 in the paid pass.)
Exam format from the PSI candidate bulletin. Exam fee: $50.
Practice the Limited Heating Service exam
Topic drills (pass required)
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Refunds: within 7 days of purchase, if you haven’t finished a full mock exam and have seen fewer than 10% of the paid questions. Try the free 10-question sample before you buy. Refund policy
Review status: pending licensed mechanical contractor review. These are original questions written to the PSI content outline and referenced to the Michigan mechanical code and LARA’s reference list. Calculations were checked by script, but no licensed mechanical contractor has reviewed them yet, so we don’t claim they are expert-reviewed. Spot an error? Use “Report this question” on any item.
What’s on the exam
| Topic | Our estimated weight | In our mock | Bank |
|---|---|---|---|
Michigan law and license scope (PA 407 Article 8)
| 9% | 5 | 8 |
Combustion, fuels, and burners
| 16% | 9 | 12 |
Ignition systems and flame safeguards
| 16% | 9 | 12 |
Controls, electrical, and troubleshooting
| 18% | 10 | 13 |
Furnaces, unit heaters, and radiant heaters
| 14% | 8 | 10 |
Sectional and steam boilers
| 12% | 6 | 9 |
Venting, draft, combustion air, and carbon monoxide
| 15% | 8 | 11 |
About the weights: PSI doesn’t publish topic weights. These are our estimate.
Test-day facts
- Computer-based at PSI test centers, after LARA approves your application.
- Closed book: no references allowed.
- Questions on PA 407 (the Skilled Trades Regulation Act) and PA 230 appear on every classification exam.
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 before you apply.
Limited Heating Service exam FAQ
How many questions are on the Limited Heating Service exam?
PSI’s bulletin lists 55 questions in 60 minutes with 75% to pass. It is closed book.
What does it cost?
PSI lists $50.
Are these the real exam questions?
No. MI Trade Prep questions are original practice items written to PSI’s published content outline. They are not actual exam questions, and MI Trade Prep is not affiliated with LARA or PSI.
Study guide: Michigan Limited Heating Service exam guide