I installed Indow acoustic inserts in my bedroom inside of windows that were relatively new (less than a year) but were poor quality, meet-minimum code requirements, "builder class" Anderson Windows. My main desire was for noise reduction, but I welcomed the added thermal efficiency. Basically, the Indows delivered on the thermal efficiency improvement, but fell short on the noise reduction. The noise I have to deal with is primarily low frequency, aircraft overflight as well as idling diesel engines. If you approach Indow about noise reduction, make sure you discuss with them the type of noise you need to reduce. I do not think that Indow tried to mislead me, but I would suggest to them that they really talk to people about noises they want to reduce. Given the cost, I am neutral on if I would buy them again. It probably depends upon how they do through time.