Transparency
See how model inputs are structured, changed and passed between tools.
Vulcan open source
Open tools for better home energy modelling
Vulcan Community is the open-source browser editor for the Home Energy Model.
Why open source
Open tools make the whole industry stronger
When the foundations of HEM modelling are open, people can understand, test and improve the workflow they depend on.
Auditability
Review methods, assumptions and changes instead of relying on a black box.
Collaboration
Improve shared foundations and build compatible tools together.
Accessibility
Give more organisations a practical route into HEM modelling.
What is open
Build and check HEM models faster
Vulcan Community contains the core local-first modelling and interoperability tools used by Vulcan.
Build the model visually
Draw a home from scratch or bring in existing building geometry.
See it in 2D and 3D
Move between connected plans and a 3D view as you work.
Reuse what repeats
Apply defaults and update repeated inputs together.
Spend less time on junctions
Generate thermal bridges from geometry, then review them.
Catch problems earlier
Check geometry and model inputs before handoff.
Keep control of your files
Work from an ordinary folder in documented formats.
Run or contribute
Use it yourself. Help make it better.
Run Vulcan Community locally with files on your machine, or improve the shared tools through issues, documentation and focused code changes.
Community source is AGPL-3.0-only, with separately identified licences for interoperability code, data and upstream components. Only Home Energy Foundry releases are official Vulcan builds; forks are independent.