All Performance Data

Multiple studies have been carried out by third-party sources testing the efficiency of Indow window inserts across a range of categories. Indow inserts have multiple functions and capabilities depending on the grade type – read the results and see the performance data of all grade types here.

Indow is dedicated to continuous improvement and innovation. That’s why we continue to test all of our products with the latest technology available. This continuous testing is important to us because it ensures we are still the best product possible for blocking noise, creating comfort, and saving you money. You can read updates about our latest testing on our blog or wait for us to update test results here.

At Indow, we have a triple bottom line which includes creating more products that are more affordable for more people. That takes rounds and rounds of testing to ensure that our new product will perform as well as our first. You can watch the kinds of tests we perform here.

A 2019 report on secondary window attachments concluded that window inserts benefit all types of spaces, specifically by increasing their efficiency and reducing cost. The Commercial Window Attachments report was compiled by Northwest Energy Efficiency Alliance (NEEA) and Evergreen Economics to understand the current market of secondary windows, their costs, how they fit with code, and their performance.

To perform their study, NEEA and Evergreen Economics interviewed architects, building owners, general contractors, energy services companies and other industry experts. They used three case studies to prove the benefits, including 2 which featured Indow window inserts. Indow was not contacted during this study.

Indow is AERC certified. AERC, the Attachments Energy Rating Council, is an unaffiliated organization that rates window attachment products on energy efficiency by measuring various factors such as Air Leakage (AL) and U-Factor.

On air leakage, Indow scored in the top two out of 33 storm windows tested, 11 of which were interior storm windows. U-Factor is an indicator of heat transfer through a surface. It tells you how well a window product insulates. Indow inserts have a U-Factor of .3, making them a top performer on insulation among all available storm windows.

If you’d like to test Indow inserts in your commercial space, use our Pilot Program. Architects interested in a sample kit or CSI specs visit our window preservation inserts page. Read more about the report on our blog, which has links to both case studies featuring Indow inserts, Commercial Window Attachments.

Other than submitting our products for testing in official laboratories, we have several professionals and experts in their field who have tested Indow inserts in their own labs and warehouses:

Scott Sidler runs his own historic restoration company, has worked with windows for decades, and calls The Craftsman Blog his “laboratory, classroom, playground, and favorite place to be”. His video of Indow noise blocking performance is a great resource of an expert opinion.

Riffs, Beards & Gear is a musician who does audio gear reviews. He got Indow window inserts for his home recording studio. He did an unboxing, installation, and review video.

One professor and Indow customer used his thermal imaging camera to capture the difference in temperature his Indow inserts made.