This paper presents the performance results of two adsorption cooling cycles which are powered by waste heat from polymer electrolyte fuel cell (PEFC) of temperature between from 60 to 80°C. The studied adsorption cooling cycles employ activated carbon fiber (ACF) of type A-20/ethanol and RD type silica gel/water as the adsorbent/refrigerant pairs. Ethanol and water are taken as refrigerants as both the ozone depleting potential (ODP) and global warming potential (GWP) are zero and they do not have any toxicity. A cycle simulation computer program was developed to study the performance of the adsorption cycles which comprise with an evaporator, a condenser and one pair of adsorber/desorber heat exchangers. System performance in terms of cooling capacity and coefficient of performance (COP) are determined and compared between the studied two systems varying heat source temperature and adsorption/desorption cycle time.