Abstract: Dehumidification apparatus is disclosed, as is a dehumidification method. The apparatus comprises a material, for example a laminate which is commercially available under the trade designation "Sanwet Sheet 4000", which is operable to remove water vapor from air circulated in contact therewith without releasing the latent heat of vaporization of the water removed, means for circulating air to be delivered to a space to be conditioned in contact with the material, means for circulating regenerating air in contact with the material, and means for heating circulated regenerating air before it contacts the material. The method comprises circulating air to be dehumidified in contact with such a material, interrupting the circulation of air to be dehumidified in contact with the material, circulating heated regenerating air in contact with the material, separating the heated air and water released thereto from the material and carrying out the foregoing steps repeatedly.