Latest / RENEWA Sanierungsnavigator / Wann lohnt sich ein Fensteraustausch wirklich?
Transcript
- Oliver: you When it to energy restoration, windows are often at the top of the wish list. At the time, you again and is it it at all? The new windows are also by CO2 and so on. This is question that has now with the current study of the IFT Rosenheim together with the Bundesverband Flachglas and the Verband Fenster & Fassade. The results are quite clear with an important restriction. decisive. How old are your windows? If you with simple glazing, box windows or uncoated insulated glass from time of 1995, this save enormous energy exchanging. The study comes to around 131 kWh per square meter window area and yes, if an old insulated glass window is by a modern three-fold heat protection window. With a typical window, this to about 220 kWh of energy per year, so with one window. It sounds abstract, but if you several windows in the it quickly up to a significant heat cost reduction and less CO2 emissions. The study says that not every window must be replaced Modern heat protection windows with coated 2- 3-layer glazing, which have since mid-90s or since 2010, are already at a very good level. Here, a premature replacement often only brings in additional savings. and is therefore mostly not economical, although there course other reasons why you want to exchange now. Quite differently, of course, with older windows. Currently, 209 million windows in are to energy-saving. Especially in houses from the 60s, 70s, 80s and early 90s, is still enormous potential only in this plant. Of course, many owners first look at the investment costs, but the study makes it that the economy does not solely on heating costs. One role is, among other things, current condition of the windows, the size of the window surfaces, the heating method, the energy prices, possible means which is very important and of course the life span of the new windows. Modern windows usually about 50 years, so a factory life span is then quite decent. And if you this long period of the exchange of energetically aged windows is actually in all cases. Especially When energy prices increase the amortization time is also If you look at where the energy prices in the next 20 years, at gas heating, oil heating or gas heating and these biogas steps, then that's just very, very huge factor. And there are also that cannot directly in euros. New windows provide much more living comfort, much less air flow and a better space climate. That means the surfaces stay warmer in air flow disappears, space climate becomes more the time, sound protection the impact protection also increases and summer less heat the building. And which factor should not be underestimated is the influence on the building value. Because a building with new windows or modern windows also simply more attractive Often can on the facade. if you want to sell it definitely worth looking it again. Overall, the points in the window exchange are often more than when you exclusively at the cost But the ecological view The whether the new window uses too much energy. The result is that so-called gray energy, i.e. energy expenditure for production, transport and installation, by the energy savings. Depending on the maintenance system, the amortization time is 2 to 11 years. The CO2 balance is even better. Here the additional CO2 emissions are after 1 to 5 years. After the window saves over the lifespan of 50 years. a window exchange is not always reasonably reasonable. You should take look it. But with older windows, the pre-construction year 1995, it is always a no-brainer and is of the economical maintenance measures ever. In there all the other criteria, space climate, air flow and course also The value increase. Nevertheless, should such a decision in a way, but always the entire building. And so we this here at Renewa. Because often the interplay of windows, insulation, heating and ventilation is the optimal renovation concept. If you want know whether new windows are actually worth of course like with individual renovation advice. So we finally out which measures have greatest effect, both energy and economically. you