Prompt and efficient action is crucial when addressing an emergency no ac service call to a package unit. Immediate assessment of the unit's operational status and any visible damage should be the first step. Thoroughly examine the electrical components, refrigerant lines, and overall system integrity to pinpoint the root cause. Implementing the necessary repairs or replacements to restore functionality is essential for the occupants' comfort and safety. Following the service, ensure the system is operating correctly and provide detailed documentation of the service performed.