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If your home has old-fashioned drafty windows that don't fit well, you probably wear a hat around the house during winter. Those cold drafts provide air ventillation and help reduce or eliminate the chance of condensation, depending on how much air comes inside.

Well sealed windows with insulating glass save energy and provide a comfortable living environment - because of this the risk increases for condensation.

Even with dual pane insulated glazing, in times of cold, in particular when relative humidity in the room is high (60 % – 80 % or more) and the room might not be properly heated or ventillated, minimal condensation can still occur, mainly along the bottom edges of the windowpane.

  • Air humidity is relative 
    • Just living normally in a house or apartment causes large amounts of moisture to build up, which must be absorbed by the air: For example, from cooking, doing the laundry, drying clothes, bathing, showering or washing the dishes. The inhabitants themselves are sources of moisture: Every day, a healthy person releases about 0.5 liters of water into the atmosphere through the skin and exhales about 1 liter of water every eight hours. A family of four ‘generates’ 10 liters of water in the form of vapor on average every day. If the living space is not properly ventilated, the vapor condensates on cold surfaces throughout the home, most frequently on glass.

The perimeter edges of a windowpane are always colder than the middle of the glazed surface. This is characteristic of all insulation glazing and is due to its structure.  In simplist terms - when warm air laden with moisture (breathing, cooking, laundry, etc.) comes into contact with cold surfaces, condensation is formed.

What can be done to stop condensation on windowpanes?

The solution lies in proper ventilation and air circulation of the room while maintaining a healthy 20% to 40% relative humidity. In addition, that also prevents stuffiness.


  • For double glazed replacement units, tempered glass and other high performance Lowe glass we offer our premier express service so that you can be assured that your repairs will be completed as soon as possible with the minimum of disruption.
  • Standard Glass Type: 
    • Clear Insulated
  • Upgrade Glass Type: 
    • Lowe Insulated
  • High Performance Glass Type: 
    • Lowe3 Insulated




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