Consultation and assistance Window replacement Save heating costs
Consultation and assistance Calculate energy costs quickly
Energy costs CALCULATE
K-value and/or U-value listed according to construction types, modification of K-value requirements for windows according to WSVO and EnEV
1976 Energy Conservation Act
1977 Thermal Insulation Ordinance I K 3.5 W/m²k for windows
1984 Thermal Insulation Ordinance II K 3.1 W/m²k for windows
1995 Thermal Insulation Ordinance III K 1.8 W/m²k for windows (equ. K-value 0.5, offset of solar heat gains)
2002 Energy Conservation Ordinance K 1.3 W/m² for windows (no threshold, usual calculated value instead)
Sources: K-Werte, Sanco das Glasbuch, Wärmeschutzverordnungen 1977 / 1984 / 1995 and EnEV 2002.
We are not responsible for ensuring that the old windows exhibit the specified heat transmittance coefficients (K- or U-values). Furthermore, we cannot guarantee that the stated savings possibilities will actually be achieved.