Believe it or not the r value is about 2 , we have multiple case studies on this. One of the biggest reason Germany uses them now is because of that . More than half the homes don't have AC, just roll shutters to control the temperature inside the house instead, then the privacy issue is awesome, I believe they have a good fit in America once they get more public. My wife can't live without the shutter in our master bedroom, loves sleeping in
