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!

20130927 074815


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:


10:21PM | 08/22/14
you may want to look at whether the sash that have moisture are covered by a half screen and the ones that are not do not have the screens. The screen mesh will alter the glass surface temperature which could be part of the reason you are seeing the issue on some of your sash but not all


04:08PM | 08/26/14
We have replaced four of the 31 windows in our home with High efficiency and these are the only windows with morning condensation outside and no views until it clears. We have a significant mountain view that is gone until this clears. This is unacceptable to just say this is normal. Why didnt the manufacture of high E have an answer to correct this and not just accept this as normal. There has to be someone that can answer how to resolve this issue without going back to lower efficiency. I am stuck with the cost of these windows and would rather go back to spending a few cents more on air conditioning to have a window I can see through.


10:01PM | 09/06/14
The point of having double or triple glazing is to insulate the interior from the exterior weather. The only explanation for exterior condensation that makes any sense is faulty seals on the windows that get exterior condensation.
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