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What are the best free building automation graphics available online?

November 18, 2025

When you’re working on building automation systems (BAS/BMS) dashboards or visualizations, having high-quality graphics for equipment, sensors, AHUs, VAV systems and more can save a lot of time and improve clarity. Fortunately, there are some excellent free graphics libraries you can use right now:

  1. Open Automation Software – Free Building Automation HVAC Symbols
    This library includes over 2,500 2D and 3D HVAC graphic symbols, such as boilers, furnaces, air conditioning units, ducting (square & tube), heat exchangers and more. Developers simply fill out a form and receive a download link for the symbols. This is a strong resource if you need large volume of generic HVAC/BAS icons.
  2. Computrols – Free HVAC Graphics Library for BAS
    Offered as Visio stencils and animations, this library covers equipment like pipe sensors, chillers, air handling units, duct equipment, etc. It’s especially useful if you already work in Visio or need animated assets for BAS interfaces.
  3. BASGFX – Cost-effective BMS Graphics Library
    Although this one lean more towards paid “cost-effective services”, it lists HVAC equipment libraries, 3D equipment and floor plan graphics tailored for BAS/BMS users. While not entirely free, it shows what’s possible and often offers sample assets or lower-cost tiers.

Why These Are Among the Best Free Options

  • They cover a broad variety of HVAC/BAS equipment (AHUs, VAVs, chillers, ductwork, valves etc).
  • They offer free download or free-tier access, meaning you can start without large investment.
  • They provide formats (2D/3D, vector/bitmap) that integrate well into BAS platforms, giving you assets ready for dashboards and system visuals.

How to Choose Which One to Use

  • Check format compatibility with your BAS software (SVG, PNG, Visio, animation formats).
  • Look at the style and resolution — does it match your interface aesthetic and screen size?
  • Review licensing — some free libraries allow unlimited use; others may have restrictions.
  • Consider the scope — if you only need a few icons, a free library is fine; if you require custom equipment visuals or branding, you might look at the paid libraries for upgrades.

Final Thoughts

If you’re starting out or working on smaller BAS projects, using the free libraries from Open Automation Software or Computrols is a great move. You’ll get high-quality graphics that accelerate your UI design and save hours of creation. As your projects grow in size or complexity, you may consider premium libraries or custom graphics to match branding, animations or 3D scenes. But for now — these free resources offer one of the best value starting points in the industry.

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