Abstract The research focuses on the investigation of newly developed foamed geopolymer prepared from copper slag industry by-product as an alumina-silicate source material. The product acts as a sustainable alternative to conventional materials having features like waste incorporation, light weight, and low heat transfer rate. The developed material was subjected to the conjugate heat transfer analysis and material was adopted to understand the flow of heat from various levels of the wall system. It was observed that the fluid temperature for foamed geopolymer layer remains below 300 (K) whereas for the conventional layer (i.e. red clay blocks) it attains 302 (K). This proves the thermally efficiency of foamed copper slag incorporated geopolymer layer, which reduces the heat propagation from outside of the building to the indoor, thus enhancing the comfort condition of occupants.