The parameters measured and instruments used for the thermal performance evaluation of the reinforced concrete walls are listed in Table 1. All the sensors listed in Table 1 were connected to a Campbell Scientific Inc. data acquisition system consisting of a CR10X datalogger, a multiplexer and a DC battery to power the data logger, which was programmed to record experimental averaged data on a 30-min basis. The data logger sampled data every 3min and stored the 30-min averaged data in its memory during the experiments, which were conducted for a period of about three months during the summer.