08:04PM | 09/09/13
I am having a similar issue on my new house. Some windows have condensation issues on the outside and some do not. In my case it even happens when I leave the windows open at night. Wide open window so the the temperature is exactly the same on both sides of the glass but the outside pane gets condensation and the inside stays perfectly dry. Any ideas?


12:56PM | 09/27/13
Hi everyone,

I found this forum due to a similar issue with new low e windows that are doing the same thing at my house. Only 4 of the 5 new ones get condensation on moist, foggy mornings but in all honesty, I didn't just pay $$$$ to get the periodic "aquarium view" in my picture windows. Also, Kansas makes a really good point, shouldn't the windows stay above dew point if insulated? Furthermore, my condensation is rectangular and soesn't cover the entire window pane (pic attached).

While I appreciate some of the "weather" explanations, Now I'm also concerned that the soon to be built retirement house will suffer similar problems and that's something I'm not willing to accept.

Thanks for any more info!



03:50PM | 09/30/13
The hardest thing for people to understand is the CAUSE of the condensation...

It comes back to 2 simple points:

1. TEMPERATURE of the surface of the glass.
2. AMOUNT of moisture in the air.

these two factors can explain condensation.

Air can hold a certain amount of water.
The warmer the air, the more water it can hold. (lots of science out there on this one)
When saturated air cools down, it has to release some of the moisture - Think DEW on the grass... Think about your ice cold drink when you are outside on a hot day - what forms on the glass? why?
The moisture collects on the cool surfaces.

Because the air temperature, moisture, and surface temperatures are always changing, it is hard to get an idea of the circumstances involing certain windows - BUT the science is always the same.

Condensation forms when the temperature of a surface drops below that of the dew point.

Was there some air movement that dried the glass off?
Air movement that brought in less moisture in the air?\
Is an area of your yard lower than another? (think fog)
Is there a bush that is giving off moisture under the window?
Is that bush giving off heat instead?
Is the window sheltered more than the others? Less?


07:16PM | 10/15/13
This is all very good information and we too are experiencing moisture on the outside of the windows, only the top half of the window only.

Another concern I have about this moisture is will this be an issue in the winter and become frost on the windows?


10:29AM | 10/28/13
Check out these two articles for some good tips on avoiding and removing window condensation. Like the others say, it's all about temperature on the surface of the glass and amount of moisture in the air.


08:15AM | 12/16/13
Andersen windows has a very good video that explains window condensation - both outside and inside your home:
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