Reflectix ( https://www.homedepot.com/b/Reflectix/N-5yc1vZ19n) has worked nicely for 4 years on ours. You can also cut it to fit on sun facing windows as well. I found a 20* surface difference, measured with my Harbor Freight laser gadget without then with it on a window
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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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