Contrary to other companies, we don't sell new windows or new double-glazed sash inserts; we reuse your aged sashes and in good shape new double-glazing units into the existing frames. So, your sash windows operate and seem the same but are much more energy-economical. The choices for secondary glazing are https://flush-ceiling-lights36791.blog2learn.com/74448999/how-energy-efficient-glazing-in-wc2e-can-save-you-time-stress-and-money