In the present work, the optical properties in the visible and infrared ranges of glass/SnO2(380 Angstrom)/Ni-Cr(15 Angstrom)/Ag(90 Angstrom)/Ni-Cr(25 Angstrom)/SnO2(380 Angstrom) and glass/SnO2(380 Angstrom)/Ni-Cr(15 Angstrom)/Ag(90 Angstrom)/SnO2(380 Angstrom) systems are compared in order to determine the influence of the external Ni-Cr Film on the optical behavior of low-emissivity multilayer coatings for energy saving applications. It has been observed that the lack of either one Ni-Cr film results in the hampering of the low-emissivity behavior (from 2.5% to 49.5% at lambda = 10 mu m), as a result of the diminution of the reflectance values in the infrared range (from 97.5% to 50.5% at lambda = 10 mu m). The lack of the Ni-Cr film also affects the optical performance in the visible range, by decreasing the transmittance from approximately 80% to 60% at lambda = 550 nm, and increasing the reflectance from about 5% to 30%. This behavior is attributed to the partial oxidation of the silver layer which might result both in a variation of the chemical and structural properties of this film.