Cutting-edge 5-chamber profile!

That is more than most other windows have. For increased stability and, above all, for better heat insulation. Five interior profile chambers with a corresponding extended construction thickness (to 70 or 79mm) keep the cold effectively outdoors and the warmth indoors in the winter-and vice versa in the summer. This saves heating energy or air conditioning costs. This is why the PREMIO vinyl window has a heat insulation value of 1.3 W/m²K. This value even exceeds the requirements of the new energy conservation regulation (EnEV) for renovations.

Quite amazing, this profile thickness!

A full 70 or 79mm. A truly high-quality window, grade A1-both in appearance and in heat insulation. You may as well demand this much window for your money.