Free Duct Design Software |top| Jun 2026

| Software | Cost | Time to learn | Accuracy | Generates Cut Sheet? | Automatic Static Pressure Calc? | Suitable For | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | | $0 | 5 min | Medium (no fitting losses) | No | No | Single branch | | Revit (Educational) | $0 (with .edu email) | 40 hours | High | Yes | Yes | Students only | | FreeCAD + Manual Calc | $0 | 100+ hours | High (if user inputs correct data) | Yes (manually) | No | Masochists & open-source advocates | | Trane Ductulator App | $0 | 10 min | High (for sizing) | No | No | Quick field checks | | LoopCAD (Free Lite) | $0 (limited to 100 diffusers) | 5 hours | Very High (Radiant/Hydronic focus, but does ducts) | Yes | Yes | Small residential pro-sumers |

: Many manufacturers and industry sites offer free web-based HVAC sizing calculators and load calculation tools . free duct design software

These tools are best for rapid sizing and friction rate calculations without the need for a full CAD layout. | Software | Cost | Time to learn

Democratizing Airflow: The Role and Reality of Free Duct Design Software These tools are best for rapid sizing and

These are not design tools but sizing wizards . Examples include apps and basic HVAC calculators on engineering portals.

Let’s design a simple residential system: a 3-ton air handler (1200 CFM) serving 10 supply registers.