Our insulated or "double-pane" glass can be found in both residential and business construction. It is required by building codes in many areas as a mandatory energy conservation measure. And it really makes sense because single pane glass has virtually NO insulating value. Bear Glass Insulating Glass (IG) units are hermetically sealed combinations of two or more lites of glass separated by a dry airspace. IG units improve thermal performance, significantly reducing heating and air conditioning costs. IG units also reduce interior condensation in cold climates.