The Uf = 1.0 W / m2K heat transfer coefficient of the profiles obtained in the research places the IDEAL 8000 system among the solutions of fundamental importance for investors interested in energy-saving construction. Achieving such results was possible thanks to increasing the depth of the profiles to 85 mm, the six-chamber structure of the profiles and the designed system of three seals. The possibility of using energy-saving glazing units with a width of up to 51 cm allows for the creation of windows with a very low thermal transmittance. For example, a reference window with dimensions of 1230 x 1480 mm with the use of a glazing unit with a coefficient of Ug = 0.5 W / m2K achieves a thermal insulation coefficient of Uw = 0.76 W / m2K, which meets the requirements for windows in the so-called passive construction. The IDEAL 8000 system is a classic structure with a central seal, which guarantees above-average properties in terms of tightness of the structure, thermal and acoustic insulation.