Free Shipping at SnapTint.com An effective and economical way to insulate drafty windows. Without expending lots money on replacing with new fancy windows, you can achieve energy efficient home in the winter by simply putting up the shrink films for the season. The shrink film is installed around the entire window to eliminate cold air drafts and frost build-up. Crystal clear film that is easy to install with a hair dryer that shrinks tight and wrinkle free. Creates dead air space to increase insulating R-Value up to 90%. The window insulator kit can save up to $17 per window this heating season. Values based on averages from the northern half of the United States. Actual energy savings are subject to change and will vary depending on furnace and window type, average indoor/outdoor temperature, length of heating season and other factors. Savings based on energy costs as of March 2009.