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Certified Double Glazing: A Comprehensive Guide Double glazing has actually become a popular option for homeowners looking to boost their home's energy effectiveness and comfort. The procedure of installing double-glazed windows includes two panes of glass separated by a layer of inert gas, usually argon, which serves to minimize heat loss and sound infiltration. Certified double glazing takes this insulation method a step further, guaranteeing that the windows satisfy specific quality standards set by