Today, the importance of the usage of energy resources and efficient usage and saving of energy is increased. Substantive energy utilized by building complexes is used for cooling/heating purposes. The heat loss in buildings arises from various sources: 40% through exterior walls, 30% through windows, 17% through exterior and balcony doors, 7% through roofs, and 6% through the undersides of flooring. Due to this circumstance, residences come to the forefront as the most important areas for energy saving and uPVC window