Insulating windows means saving with vision

Insulating windows means saving with vision


It's not just walls that store heat: Renewed windows make a decisive contribution All around energetic renovation at.

windows are proverbially transparent. The insulating effect they have can be read off from the heat transfer coefficient, the so-called U value. But please look carefully when buying, there are two values: the most euphemistic Ug value from some older advertising brochures and the more precise Uw value. Since 2010, all manufacturers must specify the Uw value - with W as Window as complete window including frame and glazing.

The denser the window, the lower the U value

Again, regulations apply: The rules of the Energy Saving Ordinance, for example determined that the Uw value of a new side window must not exceed 1.3 W / m 2 K (watts per m² and Kelvin). Modern windows usually meet this value. With two-pane heat protection glass, they undercut it, as passive house-capable windows with triple glazing even by more than half. On the other hand, double-glazed windows from the 70s or 80s often double or triple the value. No window from before 1995 corresponds to the current state of the art.

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Windows for 40 years and more

Today's energy saving windows owe their insulating effect to the tightly sealed frame next to the glazing. However, the material plays a subordinate role: If you love a natural living environment, opt for wood windows, who would like to have it easy, for plastic. Metal or wood-metal windows are the most resistant to the weather. An important criterion is longevity: on average, the windows are used for more than four decades.

Airtight and non-exhausting

Soundproof and heat-insulating window solutions are also available for historic buildings. For example, additional panels can be installed or the existing windows can be expanded to double box windows. Here, as in modern homes, exchange glasses with high-tech exterior coatings are ideal. These ensure a higher glass temperature and reduce dew formation. The old, mostly wooden frames should be sealed by a specialist. Simple foam tapes are less effective: they dissolve after a short time and cost more than they save.

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Renovation pays off and will be subsidized

The selection of the right window is not everything: Only professional installation will make it really tight. The Kfw Bankengruppe grants subsidies and loans for professional energy-efficient refurbishment. But the conversion pays off in any case. Because old, simply glazed windows let about four times as much heat escape as an equally large, uninsulated wall surface. For an average single-family dwelling with a glass area of ​​about 25 square meters, they alone waste up to 500 liters of fuel oil and thus about 350 euros per year.

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