For windows there is no such thing as an expiry date. If and when a window should be replaced depends on a number of different factors.
In many older buildings today there are often fully-functioning intact windows with wood frames and single or double glazing. However, a lot of energy and thus a great deal of money is being lost through these very windows. Almost a quarter of the heat within a room can be lost via badly insulated windows. In such a case the replacement of windows would be extremely worthwhile as energy costs are ever increasing and despite the outlay on new windows a lot of money could be saved in the long run.
However, not only the energy efficiency of the window plays an important role, but other aspects, too. For these reasons when replacing windows the following points should be taken into consideration:
Replacement of a window is especially recommended when more than one of the above points is valid.
The cost of a window when being replaced also varies. Here, too, the different conditions such as material, size, shape and colour all play a role.
When it comes to material, wood windows are cheaper than windows made of wood-aluminium. The most economical material is PVC.
The choice of frame depends primarily on the taste of the customer, as all modern and new window materials come with the best thermal insulation and sound-proofing properties.
All newer profile materials therefore contribute to energy saving. Extra costs can be incurred on replacement on choosing a special colour, an optical enhancement in the chosen glazing, window bars or by additional security features.
On the other hand, money can be saved on the installation, i.e. by doing it yourself. One must only be careful that the connecting joints are tight together but allow air to pass through during fitting.