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Conservatory Window Glass Replacement If you notice that your conservatory takes longer to heat up or you are experiencing draughts then it might be time to replace your conservatory window. Modern double-glazed windows with low U -Values will significantly improve your temperature control, reducing energy bills, and also helping protect your home from the elements. You can also select glass that reflects solar heat and helps reduce the glare. Solar control and Softcoat low-e glasses are available.