Excellent customer support and solution. I have requested secondary glazing for eight windows now, and it actually does a great work. Very first, pick curtains specifically made for noise reduction. Look for curtains that are created with many levels of dense elements and are actually examined for their soundproofing capabilities. https://hectortpalr.blogdeazar.com/26418546/an-unbiased-view-of-condensation-resistant-glazing-in-w6