Plan windows according to energetic aspects

Anyone who builds his house should definitely think about his windows. Arrangement, size and location should also be considered from an energetic point of view. How to do that and what you should think about in order to save as much energy as possible, read in this article.

Light area planning at the house

The building codes of the countries demand compliance with certain specifications when it comes to windows in the house. The minimum required number of light surfaces must not be undercut in any area of ​​the house, even if that should make energy sense.

In addition to these requirements, however, you can optimize a lot on the windows to save energy. The most important thing is:

  • Location of the windows
  • Size of the windows
  • U-value and g-value of the windows
  • natural shading
  • Ventilation solutions for the lowest possible energy loss

Location of the windows

Ideally, a house has most of the windows on the south side, and no windows on the north side. There should be as few windows in the east and west as possible on the south side. Although this makes sense theoretically, this is only ever implemented as a compromise due to the building regulations in practice.

However, one should do as much as possible in planning to get closer to the ideal. This may mean minimizing window areas in the north as much as possible and maximizing them to the south as much as possible, avoiding natural shading wherever possible

Solar radiation reduces heating costs

This is especially true when using high g-value windows (total energy transmittance). These windows let a particularly large portion of the solar heat penetrate into the rooms.

This compensates for heat losses through the window in winter, and provides an additional, high-performance heat source. If the g-value of the windows is too low, you can use this energy source in winter only limited.

Optimize U-values

U-values ​​below 0.8 W / (m²K) are generally only useful for passive houses. For all other houses, the cost of these windows is too high to really bring any measurable benefit. With U-values ​​between 0.9 and 1.1 W / (m²K), you can always find a decent level in all the usual houses.

Higher savings are then no longer achieved by lowering the U-values ​​in the window, but by optimizing the heating. This is more sustainable and effective than new windows.

Reduce heat losses when ventilating

Anyone who installs window ventilation with heat recovery right from the start can avoid high ventilation heat losses and save a considerable amount of energy.

Cold protection films reduce the U value

With a price per square meter of around 50 EUR, cold protection foils are a good way to further reduce the U-value of the windows by up to 30 percent. This is cheaper overall than to install expensive passive house windows.

Video Board: Energetic Elk