Aspen pads have a lower efficiency rating than cellulose media like CELdek or GLASdek. Aspen pads have been referred to over the years as cooling media, excelsior pads, evaporative cooler pads or swamp cooler pads.
Aspen Pads are typically discarded and replaced annually, usually at the beginning of the cooling season. Residential, commercial, industrial and agricultural application of aspen cooler pads has diminished over that past 20 years due to the growing need for longer pad life and a desire for lower seasonal maintenance and high efficiency evaporative cooling offered by CELdek and GLASdek evaporative cooler pads. If properly maintained, ridged cellulose media like CELdek and GLASdek should last multiple seasons.