Originally Posted By: hspinnler
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In my reporting, I recommend replacement of double-pane windows that have lost their thermal seals and are observed to have fogging and condensation between the panes. Windows filled with air only more than likely don’t have great insulating value anyway, but how much of a decrease is to be expected in efficiency? The National Fenestration Rating Council (NFRC) uses several criteria including “U-Factor” which I reckon is similar to R-factor with insulation. In reality, how much loss of energy efficiency can be expected and are we talking about a true requirement for replacement of windows? Of course, some realtors like to call fogging a cosmetic issue. How do you report such findings?