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Small-scale model houses were built with different masonry products in order to investigate the environmental performance of sustainable construction materials. Three model houses were designed and developed as per the standards one with recycled paper mill waste (RPMW)-cement bricks, another with fly ash bricks and the third with ferrocement wall panels. In order to assess the indoor temperature for these particular sustainable building materials, the temperature inside the model houses was monitored over the study location for the period of a year. The economic viability for the developed model houses was also analyzed. Wall surface temperature readings on the exposed south facade were used to estimate thermal conduction of the wall assembly. Detailed analysis revealed that the developed RPMW-cement brick model house was more thermally resistant and economical than the fly ash brick and ferrocement wall panel model houses. Energy efficient building minimizes energy consumption through the reduction of indoor temperature, making the RPMW-cement brick model house the best choice for construction. [ABSTRACT FROM AUTHOR]