/, Contextual, Cooling, Envelope, Heating, Long term, Owners, Physical environmental, Psychological, Social/2.1.13 Installation of efficient windows (low-E double glazing with wood frames)

2.1.13 Installation of efficient windows (low-E double glazing with wood frames)

2.1.13 Installation of efficient windows (low-E 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 Low-E double glazing and wood frames. Low emissivity glasses are equipped with an invisible metallic coating that reflects inward part of the incident long-wave energy (heating), decreasing the absorption of the own glass and, therefore, the energy that emits to the outside. A typical transmittance of this type of windows is U=1.5  W/m2K.


  • Airtightness improved

  • Energy costs reduced

  • 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

  • Improve solar and thermal control

  • Reduce summer heat gain and winter heat loss

  • Decrease UV transmission such as furniture fading

  • Reduce condensation in double glazing


  • 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.

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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