The Condition Type parameter for spaces determines how heating and cooling loads are calculated. If the Condition Type is set to Unconditioned for a space, no loads will be calculated for that space. When set to Heated, only heating loads are calculated; when set to Cooled, only cooling loads are calculated.
A zone is conceptually comprised of one or more spaces that are serviced by the same equipment. As such, Conditioned and Unconditioned spaces must not be mixed within a zone. The best practice is to create a separate zone and group the unconditioned spaces in that zone.