Double glazing
Single glazed windows cause the loss of approximately 10% heat from the room, Subsequent 15% escapes through the cracks around windows and doors. The direct result of this is not only unpleasant coldness, but also the phenomenon of condensation, from the contact of warm and humid air …

Swing windows usually consist of two sashes and a small barrel at the top. Larger windows may have more moving elements. The panes can be combined in an arched shape or in a rectangular shape (bay windows).