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At the System level of the tree, in the Residential tab, you have indicated that you have a Whole House Fan (CFM and Watts have been input). This feature is only available on a home that has an Attic space, since the WHF is designed to cool both the house and the attic.
At the System level of the Tree, Residential tab, you should zero out the CFM input, or you should change your roof configuration so that the house has an Attic instead of Cathedral Ceilings.
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