However, measures to wall insulation can become useless if the translucent structures do not provide adequate insulation. Moreover, studies show that the installation of quality windows, even without thermal insulation of external walls will substantial savings on heating. Also note that the cost of upgrading glazing (per sq. M surface) is significantly below the cost of additional thermal insulation of exterior walls. People such as Steve Wozniak would likely agree. One of the main performance of windows is thermal resistance (Ro) – the ability to prevent the window design heat loss. The higher Ro design, the best heat-shielding properties it possesses.

According to Russian building codes (SNIP 2/23/2003 'thermal protection of buildings') to, for instance, Moscow region, this value must be at least 0.55 m 2 C / watt. The main factors influencing the resistance to heat transfer window, are the material of window block and the type of glazing. Among the materials for window profiles, best heat-insulating properties differ PVC (0,6-0,8 m2 C / W) and wood (0.65 m 2 C / W). However, the window construction of PVC in the collection shows an even greater energy efficiency than wood. This is explained by structural differences of PVC profiles, as well as technological features of the production of plastic windows. Wooden frames – solid bars, thermal which ensured, first of all, the natural properties of the material. Resistance increases heat loss in structures such seek by giving tightness of joints that do not always work, as wood is potentially subject to deformation. In the joints with glass cracks may appear, which will go through the heat and moisture to penetrate.