The sun has the ability to heat excessively any space with large openings. The amount of incoming solar radiation depends directly on the aspect of the opening. All this radiation spreads to walls, floors and furniture which absorb part of it, consequently their temperature rises.

This is how the phenomenon of the green house effect works.

To avoid this phenomenon the low-e glass pane soft coat 3rd generation was created for 2 or 4 seasons depending on the needs of the space. This type of glass pane has a coat of minuscule metal oxides on one side. This coating does not permit the transmission of heat from the interior of the house to the exterior or vice versa.

Function of low-e glass panes in warm climates:

  • They reflect the infrared sunlight (heat) and reduce the cost of cooling.
  • They only allow the visible light to get through.

Function of low-e glass panes in cool climates:

  • They act as a shield against the heat trying to escape from the interior and reduce the cost of heating.
  • Maximise the beneficial energy of the sun.

Overall benefits of low-e glass panes:

  • More efficient thermal insulation in winter.
  • Easier cooling in summer.
  • They offer the lowest thermal insulation U value of 1.0.
  • Up to 35% reduction of the annual cost of heating and cooling.
  • High transmission of visible light.
  • Up to 70% reduction of incoming ultraviolet radiation which damages objects.
  • To choose the right type of low-e glass pane we are going to use in a structure, we must take into account the use the structure is intended for (shopping mall or house) and the position (if for example it is directly exposed to the sun).

There are three coefficients defining accurately the energy behaviour/performance of a glaze:

  • Light Transmission coefficient (LT): This coefficient expresses the percentage of sunlight (the visible part of the total spectrum of solar radiation) that passes through the glazing of the total light emitted.
  • Thermal Transmission coefficient or U-value: This coefficient expresses the power needed to compensate for the thermal losses per square metre of glazing and per degree of difference in temperature that needs to be maintained between the exterior and interior temperatures (watt/m2*Co).
  • Solar Factor (SF) or g – Value: This coefficient gives us the degree of the green house effect we should expect from a glazing. In other words it expresses the percentage of the total incident solar radiation that will eventually pass through the glazing to the interior.


The 2-seasons low-e glass panes have a significantly higher solar coefficient (g – Value) than the corresponding 4-seasons ones. Consequently, their application is suggested for areas where the buildings have high thermal loads, as this way they benefit from the higher percentage of solar thermal radiation that passes through the glass panes.

Glass thickness: 4 , 6 mm, triplex (4+4), also other thicknesses available upon order.


Technically speaking the low-e glass panes for 4 seasons have a small enough percentage of solar factor (g-Value), which means they prevent a significant portion of direct solar radiation from passing through to the interior of the building.

Their application makes sense for regions where the buildings have high cooling needs, since the sun falling on their openings permeates them and heats their interior.

Glass thickness: 4 , 6 millimetres, triplex (4+4) also other thicknesses available upon order.