Choose Your Exam Type
Select the specific Michigan mechanical contractor exam you need to prepare for. Each test matches the real PSI exam format with 75 questions and a 3-hour time limit.
Single Test$29
3-Test Bundle$69Save $18
All-Access Pass$149Save $257
Main License Classifications9 exams
Hydronic/Process Piping
Cat 1(a)Installation and service of hydronic heating, cooling systems, and process piping
55 Qs1hr
HVAC Equipment
Cat 2(b)Installation and service of heating, ventilation, and air conditioning equipment
150 Qs3hr
Ductwork
Cat 3(c)Fabrication and installation of ductwork systems
55 Qs1hr
Refrigeration
Cat 4(d)Installation and service of refrigeration systems and equipment
55 Qs1hr
Limited Heating
Cat 5(e)Service and repair of existing heating equipment (no new installations)
55 Qs1hr
Unlimited Heating
Cat 6(g)Full installation and service of all heating systems without restrictions
55 Qs1hr
Limited Refrigeration/AC
Cat 7(f)Service of refrigeration and AC equipment using Group 1 refrigerants only
55 Qs1hr
Unlimited Refrigeration/AC
Cat 8(h)Full service of refrigeration and AC systems, unlimited thermal capacity and refrigerant types
55 Qs1hr
Fire Suppression
Cat 9(i)Installation and service of fire suppression systems
55 Qs1hr
Specialty License Classifications5 exams
Solar HVAC
Cat 10(j)aInstallation of solar heating and cooling systems
55 Qs1hr
Solid Fuel/Decorative Gas
Cat 10(j)bInstallation of wood stoves, fireplaces, and decorative gas appliances
55 Qs1hr
LP Piping
Cat 10(j)cInstallation of LP gas distribution piping systems
55 Qs1hr
Gas Piping
Cat 10(j)dInstallation of fuel gas piping systems
55 Qs1hr
Gas Piping & Venting
Cat 10(j)eInstallation of fuel gas piping and venting systems
55 Qs1hr