Codes, Permits, and Business/Regulatory Practices
The regulatory stack
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. Work without a permit or without the required license can void warranties, fail inspection, and expose you to fines and civil liability. Always confirm current local amendments before bidding.
Refrigerant law
EPA Section 608 certification is required to service, maintain, repair, or dispose of appliances containing ozone-depleting refrigerants and their substitutes. Know the compliance points: no knowing venting, recovery before opening a system, evacuation to the required micron level, and recordkeeping for appliances above the leak-rate thresholds. Small cans of refrigerant are restricted to certified technicians.
Business practice
The exam also tests contract and jobsite conduct: written contracts with scope, price, and change-order procedures; lien rights and notice requirements; insurance and workers' compensation; warranty terms; permits and inspections sequenced before covering work; and accurate load calculations retained as part of the project record. Low-bid shortcuts - no permit, no load calculation, unlicensed subcontractors - are the classic wrong answers.
Traps
Assuming a license from another state transfers automatically, confusing the permit holder with the inspecting authority, and quoting code editions from memory instead of the locally adopted version. When a question asks who is responsible, the answer is almost always the licensed contractor of record.
Worked example
Rule of thumb: no permit, no start. On any project, confirm permit requirements, license classification, and inspection milestones before ordering equipment - retrofitting them after rough-in is far more expensive than the permit fee.