So effective is this window film at reducing energy consumption, that many power companies around the country now offer rebates for installing window film. Cost Effective for Your Building Apply the following criteria to your building. The more criteria your building meets, the more profitable it can be to install window film. The building is in a sunny location with little natural shade. Windows on the south and west sides of the building receive direct sunlight.
Windows have single pane glass.
The building is in a geographical area that has many sunny days.