When you replace old and outdated single pane windows with a modern dual pane product, you will almost always have a sound suppression effect. So, any new windows will be an improvement, but if you want the windows that will make a huge difference, we have a product for you. To understand the difference let’s get familiar with sound suppression windows vocabulary. In order to evaluate how your new windows are performing in suppressing the noise pollution, look at the Sound Transmission Class (STC) and the Outdoor/Indoor Transmission Class (OITC) ratings that are provided by an independent third-party organization. The higher the numbers are the better the windows are at blocking the noise out.