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Old 12-15-2019, 05:35 AM   #5
Dave W
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Join Date: Jul 2014
Location: Upstate NY
Posts: 1,788
M.O.C. #14547
Home Depot sells a product called Reflectix. Cut to the window size and put between the blinds and the window. It will stay in place with little support. If you use a laser temp reader you will see a significant differential with and without - in our case, over 10 degrees. The downside is that it isn't transparent.



https://www.homedepot.com/b/Reflectix/N-5yc1vZ19n
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