I am working on an existing building renovation where there is a significant amount of building floor area that is crawlspace and attic area. I am completing the v4 Minimum Energy Performance Calculator (latest Excel Table 1.4 version) as a requirement of applying LEED Interpretation 10421. In this Excel form, there are spaces to input the Conditioned building area square footage and the Unconditioned building area square footage. By following the definitions in ASHRAE 90.1, I am confused on how to classify the crawlspace and attic area as either conditioned or unconditioned. The ASHRAE 90.1 definition of an unconditioned space is an enclosed space within a building that is not a conditioned space or a semi heated space. Crawlspaces, attics, and parking garages with natural or mechanical ventilation are not considered enclosed spaces. Ventilation is further defined as the process of supplying or removing air by natural or mechanical means to or from any space. Such air is not required to have been conditioned. The crawlspaces and attics in this project both have ventilation by the above definition. There is a small amount of heating capacity designed for these spaces, enough to be considered semi-heated (>3.4 Btu/h-ft2), except that by above definitions the attic and crawlspace are not considered enclosed. Does anyone have any advice on how to classify these spaces?
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