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RLC Engineering, LLC.

 

Window Condensation Potential Chart

The following chart indicates the conditions where windows may start to show condensation. Based on an outside temperature (and assuming the inside temperature is 70 degrees F), condensation could occur at any indoor relative humidity higher that that shown for that type window.

For example: The bottom line shows a single-pane window. If the outside temperature is 30 degrees, condensation would for whenever the inside relative humidity is greater than about 32%. In contrast, if the window was double-glazed, condensation would not occur on the window until the RH was higher than about 58%. At 10 degrees outside, condensation will not occur on a single-glazed window until the indoor RH is above 17%, while for a triple-glazed window, the indoor RH would have to be above 62%.

 

  

 

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Spalding Computer Services
Last Update: 01/13/2002