The industrial-scale price of the chemicals used to prepare the electrolyte is obtained on the Alibaba e- round. For the building installed with the electrochromic mid-IR device, the emissivity of the out-layer materials is set to 0.07 and 0.92 for heating and cooling mode. We used normal buildings (the default building model with emissivity equal to 0.9) to represent the baseline. By running the model for building under cooling and heating mode, the cooling and heating load under heating and cooling mode can be obtained, respectively. P cool, c and P heat, c represent the cooling and heating load under cooling mode (emissivity = 0.92). P cool, h and P heat, h represent the cooling and heating load under the heating model (emissivity = 0.07). The energy consumption for the building per hour is calculated as below: