Standard windows with double glazing and wooden or plastic frames are available today for about €200 to €300/m2. High-performance windows as described in this section are available for about €350 to €500/m2 for small quantities (that is, single family houses in Germany). High-performance windows for office buildings can easily cost €340/m2. Obviously, windows are, at present, a high-cost item; but there is great potential for price reductions as the number of high-performance window units increases.

Furthermore, in such high-performance housing, there can be considerable savings in the reduced heating system costs. For example, there is no longer a need to place radiators under windows. For this reason, the economics of high-performance windows must be evaluated in the context of the whole building and not as a single component.

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