Wooden double-glazed windows, made of thick profile 68 mm are the most affordable price option.
Material: spruce, larch, oak
Wooden profile: 68 mm thickness
Hardware: Winkhaus
Gaskets: 2 no. on the wing
Vodobrani: 2 no. aluminum, on wing and case
Double glazing: And = 1,1 W/m²K, 4-16-4
Energy efficiency: Uw = 1,2 W/m²K