This course explores advanced concepts in air conditioning and refrigeration systems, with a focus on control systems, equipment diagnostics, and troubleshooting techniques for commercial applications. Students will analyze control sequences, system automation, and performance optimization while developing hands-on skills in equipment testing and fault detection. Through interactive lab exercises and real-world case studies, students will gain practical experience in diagnosing, repairing, and optimizing commercial HVACR systems to improve efficiency and reliability.