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Ask the Experts!

14 January 2009

ask-the-expertsI am replacing single pane windows with double pane windows, do I need to add Low E coating to my windows? I will still have storm windows in place. I am curious – it seems like the greatest benefits are in high cooling areas of the country.

Low-e coatings do provide a benefit for heating costs here in Minnesota, since they decrease the heat transmittance of windows, keeping more heat in during the heating season (and, yes, cut down on heat gain in the summer, but that’s obviously not as big of an issue). Our experts absolutely recommend installing low-e windows when you replace your old single panes.  Any window you purchase should have a label by the National Fenestration Rating Council to help you determine the efficiency of the window: here is some more information on that label.

Answer provided by Bob Mello, Building Analyst at the Center for Energy and Environment.

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