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Why does reducing air infiltration by 40% show NO savings? This is a small ranch house in a hot dry climate being reduced from .52 to .31 nACH.
There are many possible reasons for this, but I cannot give you a useful answer without reviewing the actual file. Please open the file in OptiMiser and submit an error report using the red “!” button.
Does the cooling outweigh the heating? If so, aren’t the cooling loads mostly driven by radiant gains?
It turned out that the OP had made an inappropriate override of the rejection of the cooling utility analysis. OptiMiser rejects the analysis when the results describe a home that has unusual properties. You should only override the rejection, if the home is unusual in the way described on the Analysis Details and Overrides popup. Overriding the rejection, when the home does not match that description can cause the model to stretch too far in it’s attempt to self-calibrate and deliver unstable results.
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