Double-glazed windows are a category of insulated glass unit or IGU that majorly involves two parallel glass panes to construct a particular window system. Most IGUs are either double glazed or triple glazed with the former being the most frequently chosen alternative. Double Glazing Prices may vary according to the http://stephens-allen.bravesites.com/entries/general/pointers-to-think-about-while-choosing-double-glazing