KY HVAC study guide
KY HVAC · Work through your exam, one topic at a time.
The Kentucky HVAC Contractor Licensing Examination is a trade licensure exam for people who intend to contract for heating, ventilation and air conditioning work in the Commonwealth. It is aimed at experienced technicians moving into business ownership as well as established contractors adding a credential, and it tests the full scope of the trade rather than a single product line: refrigeration principles and system components, heating equipment and combustion safety, air distribution, ventilation and indoor air quality, electrical systems, motors and controls, load calculation, sizing and system design, and the codes, permits and business practices that govern contracting. The KY HVAC study guide has 6 sections and about 2,095 words.
01Refrigeration Principles and System Components
Every question in this domain starts from four components and four states. The compressor raises pressure and temperature and discharges hot high-pressure vapor to the condenser, where heat is rejected and the refrigerant condenses to a high-pressure liquid.
350 words, about 2 min02Heating Equipment and Combustion Safety
Perfect combustion of natural gas (roughly 1,000–1,050 Btu/ft³) needs about 10 ft³ of air per ft³ of gas; real appliances run 25–50% excess air. Products of complete combustion are CO₂, water vapor, and heat; incomplete combustion yields CO, a deadly and odorless gas.
335 words, about 2 min03Air Distribution, Ventilation, and Indoor Air Quality
Airflow is measured in CFM and relates to heat transport by the sensible heat equation: Btu/hr = 1.08 × CFM × ΔT. The familiar 400 CFM per ton is a nominal rating, not a design rule - humid climates and tight envelopes often call for 350 CFM/ton or lower to improve latent removal, and high-sensible applications may use more.
355 words, about 2 min04Electrical Systems, Motors, and Controls
Ohm's law (E = I × R) and the power relationships (watts = volts × amps × power factor for single phase; ÷ 1.732 for three phase) underpin every troubleshooting question. Motors come as PSC (permanent split capacitor), ECM (electronically commutated, constant airflow and more efficient), and shaded-pole or three-phase varieties.
336 words, about 2 min05Load Calculation, Sizing, and System Design
Manual J is the accepted residential method: room-by-room envelope areas with U-factors, window solar and orientation, infiltration, internal gains, and design indoor/outdoor temperatures. The basic conduction equation is Btu/hr = U × A × ΔT ; infiltration and ventilation add sensible and latent load, and duct gains or losses (often 10–20% in unconditioned space) are added as a system multiplier.
344 words, about 2 min06Codes, Permits, and Business/Regulatory Practices
Kentucky adopts a statewide building code built on the International Codes, so mechanical work follows the International Mechanical Code and gas work follows the International Fuel Gas Code, with the Kentucky Residential Code governing one- and two-family dwellings. Local jurisdictions issue permits and perform inspections; the state issues HVAC contractor and journeyman/master licenses through the Board of Heating, Ventilation and Air Conditioning Contractors.
375 words, about 2 min