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Heat Loss

“49% of the buildings heat loss is through the windows and doors.”

Heat loss is usually caused by poor insulation in winter and is the opposite of heat gain caused by poor insulation in summer.

Usually the windows and doors are a weak part of the building. Aluminium-only frames and non-efficient glass cause the major amount of heat loss. Walls and roof usually contain timber and other materials that have a low conductivity and help to insulate.

Especially in colder climates of Tasmania, Victoria, Canberra and Southern regions of SA & WA it is important to seal the building envelope with high performance windows and doors.

You can save energy, every day. The right choice lowers your operational costs and increases your comfort levels at the same time.

Miglas windows and doors mean a heating improvement of 43% and cooling improvement of up to 54%.

The benefits of Miglas whole-of-window insulation are:

  • improved comfort all year round
  • reduced heating and cooling of around 40%
  • saves non-renewable resources and reduces greenhouse gas emissions
  • pays off in approximately 5 to 6 years
  • reduced condensation on walls and ceilings
  • noise reduction

More information about 5 star rated houses can be found here.


Movement of heat through a material. Low conductive glass, like double glazing with minimum air gap of 12mm and low conductive frame, like timber, minimises conduction.

Unwanted Air Infiltration

Siphons about half of an average home's heating and cooling energy to the outdoors. Air leakage through and around windows is responsible for much of this loss. Advanced sealing with compressible gaskets and tight hardware reduce air leakage.