Desiccant dehumidifier reduces humidity in the air by using solid desiccant materials or liquid desiccant materials to attract and hold moisture. Moisture from the air is absorbed by a desiccant contained in a revolving drum. They have three hoses, an inlet and outlet from the room and a wet air outlet to the exterior. In some CHP systems the moisture content of the air is reduced using a desiccant dehumidifier and the dehumidified air is cooled using conventional cooling equipment. These satisfy the latent cooling load by reducing the moisture content of the air. These reduce the load of the chillers to sensible cooling. It uses more energy than refrigerant types, but is more effective at lower temperatures.