What Effects the Performance of Windows

Air Circulation

A window may be in an area in which there is poor circulation of warm air. This means that the temperature of the inside glass surface is colder than in other parts of the home and this may cause condensation to form at humidity levels which are practical for the rest of the home.

Drapes

By drawing heavy blinds over a window or patio door the possibility of condensation can be increased because the flow of warm air is restricted.

Varying Humidity Levels

Remember that the humidity in some rooms, kitchens, and bathrooms in particular, can be higher than in other areas of the home.

Orientation

If windows are exposed to prevailing winds, then they will be slightly colder than the other windows in the home and may cause condensation to form at humidity levels which are practical for the rest of the home.

Exposure

Some windows in the home may be protected by other buildings, trees, etc.; which form a windbreak.

Outside Air Temperature Indoor Relative Humidity
-28°C (-18°F) or below not over 15%
-28°C (-18°F) to -23°C (-9°F) not over 20%
-22°C (-8°F) to -17°C (-2°F) not over 25%
-16°C (-1°F) to -12°C (-10°F) not over 30%
-11°C (-11°F) to -6°C (-21°F) not over 35%
-5°C (-22°F) to -4°C (-40°F) not over 40%

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