What is the purpose of the drain pan for a portable air conditioner and how does it help in maintaining the unit's efficiency?

The purpose of the drain pan for a portable air conditioner is to collect and remove excess moisture that is produced during the cooling process. This helps prevent water from accumulating inside the unit, which can lead to mold growth and reduced efficiency. By keeping the drain pan clean and free of blockages, the air conditioner can operate more efficiently and effectively.