Important software used for HVAC design and drafting

There are many softwares that are required for the calculation of many things in HVAC

1. AutoCaD- For drawing & drafting
2. Ductulator- For calculating ducts dimensions and its airflow, frictional loss, bends etc.
3. Heat load softwares that are generally made in excel itself by using formulas.
4. Pipe size and it’s flow calculation softwares like pipeflow, etc.
5. Revit - Again for drawing and drafting in 3D or 3D modelling.