640 Louisiana (New Orleans) Second Class Stationary Air Conditioning Certification Exam

640 Louisiana (New Orleans) Second Class Stationary Air Conditioning Operating a 40-ton chiller system demands more than passing familiarity with refrigeration cycles. Louisiana’s Second Class license expects competency with EPA regulations, psychrometrics, and troubleshooting compressor failures—knowledge most candidates build through apprenticeships or hands-on HVAC roles first. Without prior experience sizing ductwork or diagnosing superheat problems, the technical depth catches applicants unprepared.