You can use multiple symbols and shapes to create an HVAC plan for Visio. You can also work on HVAC by having it as a layer in an existing floor plan. Accept the scale and size of the CAD drawing. If you are doing the HVAC plan as a layer in a CAF floor plan, insert the AutoCAD drawing dialog box and click on the ' CAD' file. You will get a scaled page with a default landscape orientation. Go to the HVAC plan option, and click on ' Create' to start your drawing. If you want to create the HVAC plan as a new drawing, you can use templates from the ' Maps and Floor plans' category. Launch the Visio on your device to start with the process. Once you are satisfied with the plan, you can start the diagramming process. It will enable you to have an idea about the whole space. The first step toward creating an HVAC plan for Visio includes creating the sketch. Still, the following is how to create an HVAC plan in Visio. However, the tool has a bit of a learning curve, and there are many limitations regarding templates and symbols. Microsoft Visio is a great tool for creating diagrams.