Without getting into the weeds, we have a double pane three door slider. We also kept the original slider in place. The advantage of this is we not only reduce the noise, but also maintain the temperature in the rest of the house. Other than a fan, we did not install air conditioning or heat and were told not to, or it would be considered a room and would be taxable. We have a dining table in the space and during the warmer months we open the sliders and have breakfast out there. We do have a birdcage outside with plaint growth so no one can see in. It was the best investment we ever made. As far as cost we have had it for years and I do not remember what we paid.
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