Window quilts are either custom shop fabrications or, much less commonly, internet sales of the most common window dimensions.
There are currently no consistent thermal performance standards for window quilts. This website lists manufacturers offering a 10-year or more warranty on their products.
NOTE: All corded window covering products sold or manufactured in the US must comply with the new ANSI/WCMA Standard, A100.1-2012 “American National Standard for Safety of Corded Window Covering Products.” Be sure to only purchase products that are labeled as complying with this standard.
If you have existing corded products that do not comply, free retrofit device kits are available through the Window Covering Safety Council.
List of Qualifying Manufacturers: