I was a commercial HVAC repair technician. I was responsible for repairing and maintaining heating, ventilation, and air conditioning systems in commercial buildings. My job duties included diagnosing and repairing issues such as broken compressors, faulty wiring, and refrigerant leaks. I also performed routine maintenance tasks such as cleaning coils, replacing filters, and lubricating moving parts. I worked closely with building managers and tenants to ensure that the systems were operating efficiently and safely.