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bowgus

wrote:
I live in less than a year old house with the latest energy efficient
windows.

For the 1st year, there will be excess humidity in the building
materials in the new house ... it'll likely calm down about in the 2nd
year ... that was my experience. In the meantime, if you don't have
power ventilation, you'll have to make do somehow ... crack a window
open maybe. In my case, the new house attached to the old house, so I
put an opening at the top of the adjoining wall letting that excess
humidity go into the dry, leaky old house next door ... an excellent
solution :-)