The insert definitely reduced the amount of cold air coming into the room. The window insert has only reduced the amount of noise by 10DB in the room. We were hoping to get a larger reduction of sound. It seems to have done a good job reducing higher end noises however the lower end sounds like heat pumps were not reduced as much. With that being said, my wife is now sleeping a little better, and I am glad that we purchased the product. If you ever would like some real world testing on that type of sound, please let me know.
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