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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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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