Replacing your windows is the fastest and simplest way of reducing energy loss and thus, heating costs. Here, we have provided answers to the most frequently asked questions.

Which materials are available and what are their advantages and disadvantages?
The materials commonly available on the market are wood, wood-aluminium, uPVC and uPVC-aluminium.

uPVC windows and uPVC-aluminium windows are more affordable, require little to no maintenance and achieve excellent insulation values. At a maximum Uw value of 0.59 W/m²K, our GAULHOFER ENERGYLINE window is the unrivalled "energy saving champion".

With their natural, "breathing" material, wooden windows offer better vapour diffusion properties and an especially pleasant interior climate. When adequately built and at corresponding construction depth, they offer excellent insulation values. Combined with an exterior aluminium shell functioning as weather protection, one can also minimise their maintenance requirements. In their top configuration, GAULHOFER windows such as the wooden NATURELINE or wood-aluminium FUSIONLINE achieve unique insulation values of 0.66 and 0.65 W/m2K, respectively. These values impressively beat the value stipulated for passive houses of 0.8 W/m2K. Moreover, wooden and wood-aluminium windows such as these, doing without artificial PUR foams are to be preferred from an ecological perspective.

What do I have to keep in mind when looking for energy saving windows?
It is important that a window achieves its insulation values through adequate construction depth and sealing measures - not through glued-on PUR foams. Only such a window will live up to its insulation promises in the long run. And only such wooden and wood-aluminium windows are really "natural" and ecological.

What does the Uw value tell me?
The Uw value is the insulation value of the entire window - only this value has actual meaning. It is made up of the Ug value (the insulation value of the glass) and the Uf value (the insulation value of the frame). In case values such as the Ug value are the only ones given, one should always ask what the value for the entire window is.

Does heat insulation equal noise insulation?
Quality windows that insulate and seal always minimise noise pollution, too. However, there are numerous supplementary glass and sealing solutions to achieve better noise insulation. Since noise insulating glazing is always thicker than conventional solutions - especially when going for a combination of high-insulation triple glazing and noise insulation - one must take into account that the window must have a correspondingly deep construction depth.

Don't forget about break-in protection!
A lot has happened in the field of break-in protection, too. Modern fittings technology offers numerous optimisation options such as anti-drilling protection or mushroom pins preventing windows from being prised open.

How much glass?
The best windows currently available on the market allow for equipping even passive houses with large glass areas without making compromises - one doesn't need to employ "arrow slit" construction any longer in order to achieve good insulation values. Through positioning them on the South side, large modern glass areas save more energy than they lose. When it comes to frame-less all-glass systems, one has to pay particular attention to choosing windows that feature high-insulation wall connections and ensure thermal division of interior and exterior areas, such as Gaulhofer VISIONLINE.

Solarglass - yes or no?
Saving energy with good windows is a hot topic: Solar glass heat a house up - also in summer time. If you count on saving energy with glass windows, you will also have to think about exterior sun protection.

Who will install the new windows?
Professional installation of the windows is of particular importance. Improperly executed wall connections will significantly impair the quality of even the best windows. Cold bridges can lead to severe damage such as build-up of moisture or mould.

This is why GAULHOFER exclusively has its quality windows installed by its own professional partners.


Only have your windows replaced by a specialist!
Cheap windows and installation offers don't pay off! Even the tiniest inaccuracies during installation can damage your window in the long run. Structural damage as a result of improper sealing, condensation problems due to heat bridges and the like only become evident after a while and can once again only be mended at considerable expense.

Rehabilitate before the cold hits in!
Windows should be replaced before winter comes. Exterior temperatures below 0°C impede and slow down the use of various materials. At temperatures below -5°C, certain materials cannot be used at all.

Pay attention to the way you ventilate your home!
After you successfully replaced your windows, you should turn your attention to the way you ventilate your home. The new windows are energy-saving champions and insulate many times better than your old ones.

In order to avoid extensive humidity in the room, you must open your windows on a regular basis (short, intense ventilation).