I did cheap and cheerful window film last year and it had a much bigger effect than I thought it would. I have read Gary's section on interior storms and think that the acrylic solution makes a lot of sense for me as my windows don't have any trim around them yet and incorporating a single panel across the whole assembly would not cost much other than the cost of the acrylic. My first batch of windows are 26 that need sheets of 30-31 x 60-61 although the 60 would be a little less than ideal. I have a few questions after doing some initial shopping: First question and maybe a dumb one, if I am going to be enjoying the use of these for 50+ years, is Acrylic the right choice? How thick of sheets should I be looking for? Leakage is probably an even bigger motivation for me than insulating value because of the site and number of operating windows. Is all clear Acrylic equal? Seems like there is a huge price range for similar specs? Does anyone have any experience with any vendors especially those that cut to size? How big of a deal is shipping? Should I be limit my options to local or is this simply a best price decision? Thanks much...any other feedback is much appreciated.