Insulating glass is a combination of two or more panes of glass with a hermetically sealed spacer between the panes of glass. The function of insulation glass is to reduce sound, and thermal losses and , which offers the advantages of lower energy consumption and perfect transparency. Insulating glass is a multi-glass combination consisting of two or more panes enclosing a hermetically-sealed air space. The most important function of insulation glass is to reduce thermal losses, which offers many advantages: lower energy consumption, perfect transparency by reducing the incidence of condensation on the warm air side and the possibility of using larger glazed areas without increasing energy consumption insulating glass is the most effective way to reduce air-to-air heat transfer through the glazing. When used in conjunction with low-E and / or reflective glass coatings, IG units become an effective means to conserve energy and comply with building codes.