This seminar discusses the use of dry and liquid desiccant technologies and how to apply them creatively for the treatment of outside air. This includes a design that utilizes a combination of cooling tower water, chilled water and hot water that modulates with the outside air loads to either cool or heat the liquid desiccant to provide dehumidification or humidification of the outside air. Then, waste heat or onsite power generation to regenerate the liquid desiccant solution. A comparison of the technologies will be presented and the opportunities for both to provide comfort and energy savings to meet ventilation codes.