A computational analytical model of the thermoelectric cooler and heat sink has been developed to instruct active building wall system design [22]. The analysis results show that the total input power required to operate the TE unit decreases as the distribution density of the TE coolers increase. The thermal resistance of the heat sink plays a key role in determining the optimal number of TE coolers in all of the design configurations. Van Dessel and Foubert [23] have developed a finite elements model to calculate the heat transfer for active buildings wall systems. The results of parametric study show that for both heating and cooling mode the optimal systems can be achieved when the smallest TE-modules are being used that are spaced at relative short distances from each TE modules.