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Only ONE window sweating in house.?
My house is 5 years old. ONLY ONE window sweats in winter. The Living room window which is 5' x 8' Pella dbl pane vinyl and sweats almost always. Not more than 8' away and in same room are 2 more Anderson dbl pane windows that do not sweat at all. No other window in house sweat. Only the big one. Temp in house maintained at 70 - 72 f. Humidity holds steady at 67%. Heated with heat pump with back up electrical elements. Is this just a crappy window? seals leaking? Any ideas?
Thanks guys - I've had argon windows that blew a seal and condensation was in between panes. I still question why only ONE widow will condensate and the one a few feet over, different brand is fine.
If your house is only 5 years old it is probably pretty “air tight”, trapping any and all humidity that is in your house. Humidity in air condenses when “dew point” is reached.
Dew point is reached around 2 to 3 degrees below air temperature.
With your house at 67% humidity and at 70 – 72 degrees air temp, you are a degree or so from dew point as it is.
Any cold surface the inside air hits will bring the ambient temperature down to dew point instantly. ("Ambient temperature" simply means "the temperature of the surroundings")
Since windows, even double or triple pained ones are made of glass their surface is colder than the room air as glass conducts hot and cold.
And, since the big living room window is 40 sq ft in area, it is coolest surface in the room. Voila! Dew!
Reduce your home’s humidity using exhaust vents in bathrooms and in the kitchen when cooking, or install an air-to-air exchanger.
I doubt you have a problem with the Pella window. When an insulated window fails, the moisture will be in-between he glass panels.
Carl
DR.DOOOM-HOUSING AUTHORITY INSTRUMETAL(first come first serve instrumentals dbl vinyl)