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Double-glazing in both windows and doors has become standard for homes in the modern world and particularly those in colder climates. The ability to retain warmth in a room is the major attraction to double-glazing, but double-glazing does have some other benefits, notably the prevention of draughts and the blocking of noise pollution. For double-glazing to be effective the right kind of window frames are needed. Also, the different types of windows bring their own slightly different problems.
There are three main types of window frame used with double-glazing. These are wooden frames, aluminium frames and PVCu frames. The most popular choice is PVCu, which is also the cheapest. This is almost certainly not a coincidence. PVCu frames are very good insulators and also very durable. They do not possess the strength of aluminium frames or the appeal of wooden frames. Strength is the major attribute for aluminium frames and this makes it a popular choice for commercial premises. Wooden frames are good insulators like PVCu frames and are the preferred choice for older homes where the classical appeal of wood fits easily with the traditional appeal of periodic properties. After all, there weren't many PVCu frames around in Victorian and Edwardian times.
Double-glazing is suitable for many different types of window. The windows are normally made to standard sizes and sealed in the factory. Then the entire sealed unit is installed. The types of window available include casement, sash, tilt and turn and many more. Double-glazing is also commonly used in panels of external doors. These doors again are often factory made and fit perfectly into the manufactured door frame.
It is possible to use secondary double-glazing. This is where the extra pane of glass is fitted over the existing pane, usually on the inside. Although this is better than single glazed windows, it is not as good as the sealed units of modern factory made windows.
As mentioned above, double-glazing is standard these days in all new homes and increasingly common in older period properties. The image of the hard selling double-glazing salesman is also softening. There are many online resources which make the process of researching and obtaining quotes for double-glazing much easier.