Double glazed windows, also called insulating glass units, or IGUs, are used for proper insulation. They protect against loud sound and extreme temperatures.
Double glazed upvc windows are actually windows that are made out of two pieces of glass. The glass is inserted into frames that keeps them just a bit apart from each other so a space is created in between. It is filled with with vacuum, or with some kind of non-conductive insulating gas. Of all kinds of insulating windows, uPVC double glazed windows are one of the easiest to see through. As sound does not travel through vacuum, less sound will be able to get through into the house. Also cold and heat have trouble travelling through vacuum, so they are also stopped. It is the same principle as vacuum Thermoses use.









