645-LA 645 Louisiana (New Orleans) Third Class Stationary Air Conditioning Certification Exam

645-LA 645 Louisiana (New Orleans) Third Class Stationary Air Conditioning Louisiana’s Third Class Stationary Air Conditioning license qualifies you for hands-on roles maintaining commercial cooling systems in hospitals, hotels, and office buildings across New Orleans. Daily work involves troubleshooting refrigerant leaks, calibrating thermostats, and performing preventive maintenance on large rooftop units that keep the Gulf heat at bay. You’ll diagnose system failures using pressure gauges and electrical testers, then execute repairs that keep tenants comfortable year-round.