Abstract: In accordance with the present invention, a desiccant/evaporative cooling system for providing cool and dry air to an enclosed structure is disclosed. The system includes a desiccant chamber, at least one evaporative cooler, and a heat exchanger. The desiccant chamber intermittently receives and drys a first airstream from the enclosed structure to produce a second airstream. The evaporative cooler(s) receive and cool the second airstream to produce a third airstream at a temperature below a dew point for an ambient airstream. The heat exchanger uses the third airstream for absorbing heat from the ambient airstream to produce a fourth airstream before the fourth airstream is forced into the enclosed structure. Condensate is removed from the ambient airstream on the dry side surface of the heat exchanger. In another embodiment, a method for conditioning an ambient airstream in order to provide cool and dry air to an enclosed structure is disclosed.