Solar warmth gain coefficient (SHGC) could be the fraction of photo voltaic radiation admitted through a window, doorway, or skylight -- possibly transmitted straight and/or absorbed, and subsequently released as heat inside a home. The lower the SHGC, the less solar heat it transmits and the increased its shading capability. https://anatolei802eec4.verybigblog.com/26163400/not-known-details-about-holborn-secondary-glazing-solutions