Solar control glazing features thin metallic or ceramic coatings that reflect or absorb a significant portion of solar radiation before it enters the building as heat. The key performance indicator is the total solar energy transmittance (g-value or SHGC): the lower this value, the more effective the solar control. At the same time, the highest possible visible light transmittance (Tvis) is sought to maximise daylight use and reduce artificial lighting demand. The ratio Tvis/g is referred to as selectivity and should be as high as possible. Solar control glazing is primarily used in large-glazed office buildings, conservatories, and south- or west-facing façades to prevent overheating and reduce cooling energy costs.