Do Sketch Nano Gard window films work?

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is there a SketchNanoGard Review?

Island Lake June 24, 2020Last updated: Sept. 15, 2020

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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