Do Sketch Nano Gard window films work?

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is there a SketchNanoGard Review?

Island Lake Published: June 24, 2020, 2:37 a.m.Last updated: Sept. 15, 2020, 4:20 p.m.

Hello! 

We're looking for ways to up the energy efficiency of our building. We've looked at the typical options, but we are also exploring some more unconventional routes. We happened upon a product named Sketchnanogard, a window insulator that claims to drastically change window heat gain/loss. 

What can you tell me about it? Worth the investment?

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