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Frame and glazing unit design is so advanced now that it’s possible to achieve A+ rated energy performance with double glazing. Adding an extra pane of glass may help in a home that’s very well insulated, where there are large expanses of glass, or in homes in exposed locations, but the extra layer can reduce the effect of passive solar gain (the heat you get from the sun). We advise talking to one of our Approved Installers to help you decide.