Desiccant dehumidifiers are devices designed to remove moisture from the air using a desiccant material, which is a substance that absorbs water vapor. Unlike traditional refrigerant dehumidifiers that condense moisture on cold coils, desiccant dehumidifiers use materials like silica gel to attract and hold moisture.

These dehumidifiers are particularly effective in low-temperature and low-humidity environments, where refrigerant dehumidifiers are less efficient. They work by passing air over a desiccant material, which captures the moisture. The saturated desiccant is then regenerated, typically by heating, to release the moisture, which is expelled from the unit.

Desiccant dehumidifiers are commonly used in industrial applications, storage facilities, and environments where precise humidity control is necessary. They are also quieter and can operate in a wider range of temperatures compared to refrigerant dehumidifiers.