Thermal bridge calculation software for Uf values, Psi values and isotherms
WINISO® is professional thermal bridge calculation software for windows, façades, glazing systems and construction details. It enables accurate calculation of Uf values, Psi values, Ug values, U-values, isotherms, surface temperatures and temperature factors, while supporting major standards such as EN ISO 10077-2, EN ISO 10211, EN 673, EN ISO 6946 and DIN 4108-2/-3.
Designed for practical engineering use, WINISO® combines highly automated CAD preparation, flexible FEM meshing and fast calculation times with user-friendly operation. Imported CAD files can be prepared through automatic detection and correction of CAD errors, allowing even complicated components and systems to be analysed efficiently with short computing times and small data sizes. The integrated FEM calculation kernel ensures highly accurate results for professional thermal analysis.
WINISO® offers a combination of technical precision, practical usability and long-term reliability:
- Certified thermal bridge calculation software by independent testing institutes
- Results are internationally recognised
- Extremely user-friendly operation
- Reliable partner for long-term customer satisfaction
- Market-ready solutions even before the relevant laws and standards are passed, together with permanent updating – our solutions are always up to date
WINISO® includes a wide range of advanced functions for thermal bridge calculation, window and facade analysis, and construction thermal performance assessment:

- Highly automated geometry preparation of CAD data (.dxf & .dwg)
- Detailed transfer of CAD data including radii and bevels
- New solver and new calculation core with automatic FEM meshing
- Automatic FEM meshing can be controlled flexibly and specifically, resulting in high calculation speeds
- Calculation according to the radiosity model (new cavity model according to EN ISO 10077-2:2018) and with equivalent conductivity (EN ISO 10077-2:2012/2018)
- Simple definition of foils, coatings and surface properties using line drawings
- Automatic material allocation based on CAD layers
- Gas filling for inter-pane spaces according to DIN EN 673, freely mixable
- AutomatedUf calculationof window and façade profiles
- Psi-valuesof thermal bridges and insulating glass spacers according toEN ISO 10211andEN ISO 10077-2
- Ug-valuesof multi-pane insulating glass according toEN 673
- U-valuesof any construction according to EN ISO 6946
- Calculation ofisotherms, surface temperatures and temperature factoraccording toDIN 4108-2/-3
Efficient CAD-based thermal analysis for thermal bridge calculation of
window and facade
WINISO® is developed to simplify the transition from CAD data to reliable thermal calculation. Thanks to automated geometry preparation, detailed CAD transfer, and automatic correction of CAD errors, users can process complex profile geometries and construction details with minimal manual effort.
The software supports highly accurate FEM-based calculation while keeping data sizes compact and computing times short. This makes WINISO® especially suitable for professionals who need dependable results in engineering, façade development, window design and product performance verification.
Standards-based calculation software for thermal bridges, Uf values, Psi values, Ug values, U-values, Isothermes
WINISO® supports thermal and structural calculation workflows based on widely used national and international standards. Depending on the application, calculations can be performed for:
- Uf values according to EN ISO 10077-2
- Psi values for thermal bridges and spacers according to EN ISO 10211 and EN ISO 10077-2
- Ug values according to EN 673
- U-values of constructions according to EN ISO 6946
- Isotherms, surface temperatures and temperature factors according to DIN 4108-2/-3
In addition, the implementation of the radiosity model and equivalent conductivity methods supports advanced and standard-compliant analysis of cavities and thermal performance.
Example window calculations by WINISO Software
PVC-window: Uf and ψg according EN ISO 10077-2
Calculation of frame U value Uf and edge bond ψ value ψg according to EN ISO 10077-2 for a PVC window
Alu-window: Uf according EN ISO 10077-2
Calculation of frame U value Uf according to EN ISO 10077-2 for an aluminium window
















