Condensation on the exterior side of a sealed unit is a phenomenon that happens on high performance glass as Super HP® glass.
Exterior condensation usually happens when these parameters are met:
• High relative humidity level (ex.: ext. temperature near the dew point)
• High performance glass
• Early in the morning
• Direct exposure to a clear sky toward North, East or South.
• Wind absence
If the
surrounding temperature is slightly over the dew point and the glass
temperature is slightly below: Condensation will occur on the glass.
This phenomenon happens because of high performance systems limiting the inside heat from escaping to the outside.
Because
all the conditions mentioned here happens quite rarely, it's relatively
seldom that we can observe it, even on high performance windows.
When you come across it, you can be assured that a superior window system has been installed.