Ferroaluminophosphate zeolite with an iron content of 5 mol%, named Functional Adsorbent Material Zeolite 01 (FAM-Z01), and the silicoaluminophosphate zeolite with a silicon content of 7.2mol%, named Functional Adsorbent Material Zeolite 02 (FAM-Z02), were studied as adsorbents in a desiccant cooling system. Adsorption isotherms of water vapor were measured by use of a volumetric adsorption apparatus under vacuum and by thermogravimetric analysis at atmospheric pressure. FAM zeolites were able to adsorb water vapor at lower humidity and desorb water vapor at lower temperature than conventional adsorbents such as silica gel or Y type aluminosilicate zeolite. This behavior indicated that FAM zeolites will be useful to extend the working temperature of desiccant cooling to below 70 degrees C. A desiccant rotor containing FAM zeolites or silica gel as the main component was also evaluated at various regeneration temperatures and air conditions. It was found that the dehumidifying performance of the FAM-Z02 rotor was 11-22% higher than that of the silica gel rotor at the regeneration temperature of 50-70 degrees C.