Key parameters of efficient windows in a passive house
Windows are the sensitive point of housing and are responsible for 22% of heat losses in a passive house (12% from frame and 10% from glazing).
It is essential to choose windows correctly in order to minimize these heat losses.
But windows also bring light into the house, provide ventilation, regulate solar gains inside the building and provide a view of the outside.
The glazing must both minimize heat losses and allow enough solar radiation to pass through to heat the house. It is therefore necessary to find a balance between thermal losses and solar gains. The glazing must therefore meet certain thermal characteristics.