The Kentucky HVAC exams pull from three different worlds at once: the mechanical and fuel gas codes, the licensing law in KRS 198B, and the refrigerant rules under EPA 608 — now shifting again as the industry moves to A2L refrigerants. This bench covers all three so you are not studying from three different books.
Ventilation rates, duct construction and support, combustion air, clearances, appliance installation, condensate. The IMC material that shows up as straight code lookup.
Pipe sizing and materials, venting categories, appliance connectors, shutoffs, pressure testing, and the IFGC rules that trip up people who came up on the electric side.
Superheat and subcooling, charging by method, the pressure chart, diagnosis from readings, recovery, leak repair, and EPA 608 certification categories.
Licensing classes, master versus journeyman scope, permits and inspections, and contractor obligations under KRS 198B.
Most study material still assumes an R-410A world. As the industry moves to A2L refrigerants like R-454B and R-32, the rules around charge limits, leak detection, ventilation, and equipment handling are changing — and exam writers follow the code. Those questions are already in the bank.
A fixed-orifice system in cooling shows high superheat and low subcooling. What is the most likely cause?
Why: High superheat says the evaporator is starved; low subcooling says there is not enough liquid stacking in the condenser. Both pointing the same direction is the classic undercharge signature — a restriction would starve the evaporator while subcooling rose. Diagnosis questions are drilled as pairs like this so you learn the pattern, not the answer.
Every plan opens the whole HVAC bench.
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The refrigerant-handling material is in the bank, including the certification categories and the recovery and leak rules. It is good preparation, but EPA 608 is its own federally administered test — take it through an approved certifying organization.
Both. Master-level material — scope, supervision, and the business and law side under KRS 198B — is included and can be drilled as its own category.
Then the fuel gas and commercial ventilation categories are where your points are hiding. The weakest-topic tracker will find that for you within your first couple of quizzes and point the drill button at it.
It gets revised as the codes and EPA rules settle. Active members get every revision at no extra charge.
Leave an email and we will tell you when the HVAC bank gets a significant update — new code editions, A2L rule changes, EPA revisions.