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ThermX Documentation
Everything you need to know about using ThermX for 2D heat transfer analysis.
Welcome
ThermX is a modern, cross-platform tool for 2D steady-state heat transfer analysis of building components. It uses the Finite Element Method (FEM) with GPU acceleration, automatic meshing, and full results visualization — and can read and write LBNL THERM (.thmx) files.
Use the sidebar to navigate, or pick a topic below:
Getting Started
Getting Started
Installation, system requirements, and first launch.
Keyboard Shortcuts
Quick reference for all hotkeys and mouse controls.
Core Workflow
Geometry
Drawing tools, boolean operations, layers, and groups.
Materials
37 built-in materials, custom properties, categories.
Boundary Conditions
Convective, fixed temperature, adiabatic, CEN/NFRC presets.
Meshing
Auto meshing with quality controls via spade WASM.
Solving
CG, Cholesky, WebGPU, and wgpu solvers with auto-detection.
Results
Temperature maps, isotherms, U-factor, PSI-value, fRsi.
Advanced Topics
ISO 15099 Glazing
Multi-pane window analysis, gas properties, U-value calculations.
Underfloor Heating
Circular pipe modeling, convective heat transfer, mesh integration.
Authentication
User login, license keys, token management, API integration.
Architecture
System design, components, data flow, dependencies.