Betty
Believe it or not when it comes to wind strength Glass has it over Acrylic. I think Acrylic is rated at 70 plus mph while normal glass is better thabn 100 mpr. I am fairly certain that you are recommended to remove your acrylic windows from your lanai if you are expecting sustained 70 plus MPH winds. That said this has not been a problem in TV in recent years so that is why alot of people go with Acrylic.......cost wise glass is not that much more expensive and it really depends upon the type of glass you get (ie insulated, low E, tinted etc.). The other thing that impacts wind is the framing that the enclosure will be installed with..with glass being much heavier you cannot simply place a glass window on the 2X2 aluminum framining currently now in your lanai whereas acrylic in some cases is simply placed on this frame thus reducing costs.
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