Installing A-rated double glazing in a single-glazed semi-detached home could save up to £140 a year. With A++ rated double glazing, the savings could be up to £150 a year. Over the lifespan of the windows (20+ years), the cumulative savings can be significant, potentially covering a portion of the initial installation cost. Improved insulation from uPVC double glazing can also lead to increased comfort and a more pleasant living environment.