Multi-layer coatings of metal-dielectric type were prepared on a poly (ethylene terephthalate) (PET) film using chemical and physical preparation techniques. Hydrolysis of tetrabutyl titanate (TBT) followed by condensation gave rise to well-controlled transparent dielectric layers with relatively high refractive index and a silver layer was prepared by vacuum evaporation. Changes of chemical coating condition gave various types of optical characteristics. This film reduces energy dissipation from a single windowpane by around 35%.