Final answer:
The recommended solution for Cool Air Conditioners to track field service activity and assignment to technicians is to install an AppExchange product that provides Field Service functionality.
Step-by-step explanation:
The recommended solution to meet Cool Air Conditioners' requirements of tracking field service activity and assignment to technicians is to install an AppExchange product that provides Field Service functionality. This will enable them to efficiently manage field service jobs. By installing an AppExchange product, they can leverage additional features specifically designed for field service management, such as scheduling, dispatching, and tracking of technicians and work orders.