You can activate visibility for spaces and HVAC zones in floor plan and section views. 
Zones and spaces cannot be made visible in elevation views or 3D views. 
- With the floor plan or section view active, enter VG on the keyboard. 
 
- On the Model Categories tab of the Visibility/Graphics Overrides dialog, scroll down to HVAC Zones. 
 
- Expand HVAC Zones and verify that Boundary, Color Fill, Interior Fill, and Reference Lines are selected. 
 
- Scroll down to Spaces, and use the same method to activate visibility for spaces. 
 
- Click OK.