CS90-H / CS90-E DEHUMIDIFIER WHY THE NEED FOR A DEHUMIDIFIER? The EIPL CS90 commercial/industrial dehumidifier was designed to provide energy efficient humidity control in a wide range of applications including offices, laboratories, apartments, storage areas, restaurants, bars, museums, locker rooms, computer, telecommunication rooms and basements. It is a quiet, high efficiency, high capacity unit designed to suit your HVAC needs.