Window Quilt insulating window shades are the an effective way of using window treatments to help insulate as well as seal against drafts, thus strongly increasing the insulating value of your windows.

It’s true, these insulating pieces dramatically reduce heat loss through your windows. Your windows are usually responsible for one of the greatest amounts of heat loss in your home. But window quilts can increases the R-value of your windows (up to an additional R-value of 4.99) and make your home more comfortable at any time of the year These shades reduce heat loss through windows by more than 80% in the winter and reduce solar heat gain in the summer by up to 79%.

Pretty impressive.