AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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How old or less than perfect condition are your current windows?
There are many brands that manufacture triple pane windows.
A few years back I was installing them and the amount of noise cut down was huge. I was working under the Airport Authority replacing windows/doors and adding extra insulation to homes under the flight paths to the local airport.
They are usually a combo of a dual pane with an added single pane on the outside, all in one frame.