1.1.11 Adding a low Emissivity (E) window film

1.1.11 Adding a low Emissivity (E) window film


A low E film is an extremely thin layer of metal oxides, in the order of nanometers, which, if it is applied on the glass, provides a capacity of reinforced thermal insulation. The film reflects inward a part of the incident long-wave energy (heating), decreasing the absorption of the own glass and, therefore, the energy emitted outside.


  • 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


  • To obtain the best results, it is necessary to carry out a blower door test

  • It can reduce valuable solar heat gain in colder climates

Economic assessment

Low investment. The approximate cost of low emissivity layers is 20 €/m2, although it varies for each type of layer.

References and best practices

Image gallery


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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