Is Condensation on Double Glazed Windows Barking? A property specialist has warned that if you see condensation on your double glazed windows it could be an indication of an issue with your window fittings. Modern double-glazed windows feature two panes of insulating glass sandwiched between them. This stops loss of heat to the outside and keeps your home warm https://www.othmar.co.uk/who-is-the-worlds-top-expert-on-barking-windows/