Introduced more than30 years ago, window film today is engineered using advanced technology to deliver energy savings similar to low-e windows, yet at a fraction of what replacement windows cost. Just like new windows and doors, window film is rated by the NFRC (National Fenestration Rating Council), so homeowners and property managers can be sure of the benefits. For single-family homes, window film installation costs can range from $4 to $11 per square foot, depending on the location and type of window film installed, and the process can be completed in one or two days, without a major disruption in use of the rooms where the windows are located.

Source: Green Building: Why Waste a Window? — Environmental Protection