Expanded glass sphere/lauryl alcohol composite in gypsum: Physico-mechanical properties, energy storage performance and environmental impact assessment

•GS/LA provided a warmer room temperature for more than 18 h and achieved 2 ℃ warmer room.•EGS/LA attained cooler room center temperatures for more than 5 h with a maximum difference of 3.6 ℃.•Carbon emission saving of 3–23.2 kg-CO2/kWh was achieved depending on fuel type for EGS/Gypsum with LA.•The proposed EGS/LA can offer noteworthy advantages by reducing the cooling and heat load of the room.