Curtain wall glass can contribute to the energy efficiency and sustainability of a building by reducing the need for artificial lighting and HVAC systems, and by providing natural ventilation and thermal insulation. This article examines the different types of curtain wall glass and their energy and environmental performance, and how to optimize their design for sustainability.Curtain wall glass is exposed to various environmental factors, such as wind, rain, and UV radiation, which can cause degradation and discoloration over time. Therefore, proper maintenance is crucial to preserve its appearance and performance. This article discusses the best practices and tools for maintaining curtain wall glass, including cleaning, sealing, and repairing.