To answer your question(s).
Sorry my English not so good. I try to explain very short, hope you know what it mean.
FOR PANEL SCHEDULES (2) OPTIONS:
(1) you can use excel at manual input.
(2) If you really want to stay in Revit panel schedules. Try to panel input (how: manual select and add it to the Revit panel schedules). HOPE THIS HELP
FOR MECHANICAL UNITS, EQUIPMENT, VAV BOX IN AUTOCAD. (2) OPTIONS:
(1) Link autocad..... Mechanical Units only. In Revit add j-box and make connection(s), homerun. And agian, panel schedules can be done in manual seletion.
(2) If you want this be done in Revit.... Alot more work for you.
a. Create a family for all units (HVAC, EF, VAV, etc....) and make electrical connection. Becareful If workset required in the project.
b. THIS WILL BE YOUR OPTION. Create a pullbox with H"xW"xD" for VAV, EF, etc... and make electrical connection to it.
Agian, all electrical panel schedules for Revit can be manual input.
Wish you luck!