> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/sign-up-and-plans/news-and-updates/2025/introducing-our-free-heat-transfer-simulator.md).
# Introducing Our Free Heat Transfer Simulator
It's taken time to get here. A lot of testing, learning, rebuilding, more testing. So we're excited to share something we've been working on for the last couple of months: our Heat Transfer Simulator.
### **Thermal Analysis Directly in Your Browser**
The Heat Transfer Simulator is a comprehensive web-based thermal modelling application that enables architects, engineers, and building scientists to create, simulate, and analyze 2D heat transfer models. It provides an integrated environment for geometry creation, material assignment, boundary condition specification, mesh generation, and steady-state heat transfer simulation directly in your browser.
**Key Capabilities:**
* **Visual geometry creation** with precision drawing tools including structural steel sections
* **Thermal simulation** using finite difference analysis
* **Material library** with 49+ predefined building materials
* **Boundary condition management** with 6 standard conditions
* **Interactive results visualization** including temperature contours and heat flux vectors
* **U-value and PSI-value calculation** for thermal performance analysis
### **Built on Solid FEA Principles**
This is version 1.0 Beta, which means we're releasing it knowing there's more to learn, more to refine. Use it for preliminary analysis and design exploration, but verify critical results through other means. We're transparent about that because it matters.
The tool is built on finite element principles similar to FEAScript, using Gauss-Seidel iteration for solving steady-state heat conduction. If you want to understand the math behind it, the documentation walks through everything from the governing equations to the numerical formulation.
### **Free Thermal Modeling Tool for Architects and Engineers**
It's free to use. No barriers. Just register, open it and start modelling.
Ready to get started? [Here are the docs. ](/user-guide/tools-and-plugins/heat-transfer-simulator.md)
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