Julia,

You are correct that if the spaces are neither heated or cooled, there
is no need to model heating or cooling systems in either the proposed or
baseline models. Reference: The paragraph "HVAC System Types" in the
link below:
https://www.usgbc.org/ShowFile.aspx?DocumentID=3198

For the cooling-only spaces, they should be modeled with both cooling
and heating systems. Use "electric and other" heating source
classification for baseline model per Notes #2 under Table G3.1.1A in
ASHRAE 90.1 2007. The proposed model needs to have electric heating as
well per Table G3.1 No. 10.

Sophi Feng, PE, CEM, LEED AP