SeriousWindows combines low-Emissivity coated films suspended in the air space of an insulating glass unit, in combination with a engineered selection of glass. The results window with multiple air spaces, with the look and weight of double-pane glass and with far superior insulating and shading performance. There are nine different Heat Mirror coatings, providing a wide range of insulation and solar control performance options to fit the energy and aesthetic demands of any building.