 Thermochromic smart windows, TSWs, have been developed to provide both thermal insulation and privacy protection. These windows use two different mechanisms to control their opacity-transparency opacity properties depending on the temperature. The first mechanism uses a surfactant that changes its physical state when exposed to heat or cold, while the second mechanism uses a polymer that expands or contracts based on temperature. By combining these two mechanisms, TSWs can be made to transition from transparent to opaque at a certain temperature range. This allows them to provide optimal thermal insulation and privacy protection without having to manually adjust the settings. This article was authored by Han Lu, Chen Wei Yan, Ping Chi, and others.