Bilt Best Wood Window Glass Glazing Replacement Options are definitely important as youn consider restoration and refurbishment work. The “Glazing” is the industry technical word for “glass.” The glass replacement options you select will impact the overall energy efficiency of your refurbished or restored Bilt-Best Wood windows. Clear, insulating glass was the standard on BiltBest Windows, and we now offer upgrades to include argon gas filled, LowE and other reflective coatings and tintings for increased energy efficiency to help control heat gain and loss. Consult with your BiltBest Window Replacement Parts Authorized Retailer to select the right glazing options for your region.