Abstract: An enhancement panel for a skylight or window that may be part of an assembly having one or more glazing panels suitable for being retrofitted to existing skylights, windows and doors. A panel, also referred to as a glazing, may typically be a transparent part of a door, window, or skylight usually made of a transparent or translucent material, e.g., glass, plastic, acrylic, polycarbonate structured sheet, etc. Alternatively, a pre-assembled skylight, window or door, may include an exterior panel and an enhancement panel in a pre-existing manufactured package to be installed as a single new package. The enhancement panel may create a thermal cavity between the exterior panel and the enhancement panel. Such a thermal barrier may greatly improve the thermal properties of the overall door, window or skylight.