Conducteo — The Complete Guide: Open-Source Thermal Bridge and ψ-Value Calculations
Conducteo is open-source software (GPLv3) for calculating linear thermal bridges in envelope details: wall-to-slab junctions, window frames, balconies and foundations. You draw the section with its materials and boundary conditions, and the program solves the two-dimensional heat flow.
Conducteo
Clément Marcel (open-source project)
Linear thermal-bridge calculator to EN ISO 10211 — ψ-values and condensation risk for envelope details.
Get it from the vendorWhat you get
- ψ-value — the linear thermal transmittance, calculated automatically.
- Surface temperatures — where the detail is coldest.
- Condensation risk — on the surface and within the layers.
- Standards — EN ISO 10211, EN ISO 10077-2 and EN ISO 13370.
- Calculation report — a tidy export for the design file.
What to know
The interface is in English and French, and the program runs on Windows, macOS and Linux. Development has slowed in recent years, but the tool is stable and well suited to focused checks of individual details. It does not replace an annual building simulation — it checks the detail itself.
Related tools
The well-known alternative from LBNL is THERM, and for window calculations — WINDOW. For simulating the whole building — EnergyPlus.
THERM
Lawrence Berkeley National Laboratory
2D heat transfer analysis of envelope sections — thermal bridges, U-value and condensation checks.
Get it from the vendor
WINDOW
Lawrence Berkeley National Laboratory
Thermal and optical properties of glazing systems — U-value, SHGC and visible transmittance.
Get it from the vendorEnergyPlus
US Department of Energy
Annual building energy simulation — envelope, HVAC, thermal comfort and daylight. The US DOE engine.
Get it from the vendorThe bottom line
Conducteo is a free, fully open tool for thermal bridge checks — ψ-values and condensation risk with no commercial licence.