Window Film can cut energy costs by up to 30% |
The IWFA study compared the installation of window film on home residences to adding ceiling insulation, air sealing, replacement of air conditioning, and replacement of heating. Out of all forms of energy optimization, the study showed that: "…internal and external window films save more energy per dollar spent than typical retrofit features. From a state energy policy perspective, internal and external window films are more effective than ceiling insulation, replacing mechanical equipment and air sealing…"
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