/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Physiological, Psychological, Social/2.1.16 Installation of efficient windows (solar control double glazing with wood frames)

2.1.16 Installation of efficient windows (solar control double glazing with wood frames)

2.1.16 Installation of efficient windows (solar control 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 solar control double glazing and wood frames. Solar control glasses have the property of reflecting part of the energy of the received solar radiation, decreasing the amount of energy that passes through the glass. A typical transmittance of this type of windows is U=1.5  W/m2K


  • Airtightness improved

  • Sound insulation

  • 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

  • Solar control glasses cut utility costs by 30% to 40%

  • Solar control glasses can block 99% of UV light that fades furniture.


  • Double glazing cannot be repaired

  • During the summer months, trapping heat inside glass panes can lead to a stale 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

  • Valuable solar heat gain in colder climates can be reduced

Economic assessment

The price is usually high.

Table 5. Cost savings of wood frames. Source: Elaborated by CIRCE.

References and best practices

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Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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