HVAC tab in model data
You can load generic HVAC data by clicking on the Template option under HVAC Template and then by clicking on the '...' at the right of the line.
When you make a selection from the list of HVAC templates, data from selected template will be loaded to the model.
The rest of this HVAC section is split into 3 main sections for each of the 3 HVAC model options:
Also independent of HVAC model options:
See also the HVAC Model Data Tutorial