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Building automation simulator

A live HVAC system you can run in your browser.

BAS Dojo simulates air handlers and VAV boxes in real time. Watch air move through the 3D graphic, read every point, and override anything to see what the controls do next.

Launch simulatorSee what's included

Free to open. No sign-up. Runs entirely in your browser.

3D view of a VAV box with colored airflow and live point readouts
Open the simulator for full controls.

What the simulator does

Each unit runs a simplified physics model with control sequences based on ASHRAE Guideline 36. You change conditions, the controls respond, and you see the result.

  • See the air

    A 3D graphic shows airflow, temperature and damper positions as they change.

  • Read every point

    Inputs, outputs and setpoints in a Metasys-style points list, with live values.

  • Override anything

    Command a damper, fan or setpoint and watch the sequence react. Overrides are marked so nothing hides.

  • Change the conditions

    Set the outdoor temperature and occupancy schedule, and run the clock at up to 10×.

Equipment

Available now, and what's next.

  • Available

    VAV box

    Damper, airflow and discharge temperature control.

  • Available

    Air handler

    Mixing box, filter, coils and supply fan with economizer.

  • Coming soon

    Air handler return fan

    Return fan tracking with the supply fan.

  • Coming soon

    Fan coil unit

    Fan, chilled and hot water valves.

  • Coming soon

    Chilled water plant

    Chillers, pumps and cooling tower.

  • Coming soon

    Hot water plant

    Boilers and pumps.

Runs in your browser

  • Nothing to install. Runs in any current browser with WebGL 2.
  • Your systems save in this browser. Export and import them as files.
  • Run the clock at 1×, 2×, 5× or 10×.

Open a running system.

Start with a VAV box and change anything.

Launch simulator