Sorptive single-blow processes which adsorb simultaneously water vapor and carbon dioxide for applications in desiccant air-conditioning systems and indoor air quality control are documented. Cosorption processes are simulated for three different adsorbents, BPL activated carbon, silica gel (grade 40), and 13X molecular sieve. The process air stream is assumed to consist of binary mixture of water vapor and carbon dioxide, and the finite heat and mass transfer rates are assumed between air stream and surface of the adsorbent. The cosorption isotherms (equilibrium equations) of water vapor and carbon dioxide, correlated from available experimental data, are utilized to simulate the sorption processes. The dynamic cosorption performance of the three solid adsorbents exhibit widely different sorption characteristics, including the roll-over effect.