/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Psychological, Social/2.1.10 Installation of efficient windows (double glazing with wood frames)

2.1.10 Installation of efficient windows (double glazing with wood frames)

2.1.10 Installation of efficient windows (double glazing with wood frames)


This measure consists in the replacement of inefficient windows (e.g. aluminium frame without thermal brake and single glazing) for an efficient one with double glazing and wood frames. A typical transmittance of this type of windows is between U=1.9 W/m2K and U=3 W/m2K, better performance than inefficient windows which have a typical transmittance higher than 4 W/m2K.


  • Airtightness improved

  • Limited condensation

  • Sound insulation

  • Safety

  • Reduce heat losses

  • Wood is the most natural material and allows that the walls sweat from the inside to the outside. The same properties of wood regulate humidity naturally inside of the building.

  • It allows the installation of any security system for preventing theft, which applies both in the enclosures (mechanical systems in doors and windows) and those who are connected to a central.

  • The majority of woods used are suitably treated against fire, ensuring a greater resistance than other non-combustible materials


  • Double glazing cannot be repaired

  • During the summer months, trapping heat inside glass panes can lead to a suffocating and uncomfortable room

  • Wood is the material that more maintenance requires. It is recommended to varnish the external side every two years.

  • It is not advisable the use of wood window frames in buildings located in areas with strong wind and rain. These climatic conditions cause heavy wear on the material, hence increase the need to be repaired.

  • Other enemies of wood, such as solar radiation and the emergence of organisms (fungi and insects), can be treated with components such as resin or insecticides. It should be paid special attention to the moth. There are many chemicals against the emergence of the woodworm.

Economic assessment

The price is usually high. Energy costs are reduced.

Table 1. Cost savings of wood frames. Source: Elaborated by CIRCE.

Type of frame

Total cost (10 m2 of windows and 6 months) % saving
Aluminium without thermal break

1.27 €/day


Wood 0.87 €/day



References and best practices

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Carried out by:

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Reduce consumption of:

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Type of driver:

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Time framework:

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Type of measure:

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