Korea's new smart window cuts 80° Fahrenheit temperature, urban glare

Researchers at KAIST have developed an advanced smart window technology called RECM (Reversible Electrodeposition and Electrochromic Mirror) that significantly enhances energy efficiency and urban comfort. Unlike traditional windows that passively respond to light and temperature, the RECM smart window actively controls the transmission of visible light and near-infrared radiation through electrical signals. This technology addresses major issues such as heat gain through glass surfaces, which contributes to substantial energy loss in buildings, and urban glare caused by reflected light, improving both indoor climate control and pedestrian visual comfort. The RECM window operates in three modes: a transparent mode allowing sunlight and heat to warm interiors during cold periods; a deep blue tinted mode that absorbs light and heat for privacy and temperature regulation; and a reflective mode where a silver coating reflects sunlight and heat while reducing glare for pedestrians. Testing with a miniature model house demonstrated that the RECM window could reduce indoor temperatures by approximately 81°F (27.2°C) compared to conventional glass, highlighting its