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When calculating lifecycle costs, a heatless desiccant dryer may be considered to be more expensive to own because it uses a substantial volume of compressed air for purging during regeneration.

Dew points can be down to 40°F. Heatless regenerative desiccantdryers. This "twin-tower" design has two tubes, or towers, of desiccant. Moist incoming air passes through one tower and is dried.