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That is correct. You do not need Design Days to be defined in your model if you have either:

1. No HVAC system to be autosized in your model,
2. A hardsized (i.e., user-entered sizing values rather than autosized) HVAC system in your model, or
3. An autosized HVAC system using an alternative sizing method (e.g., using SizingPeriod:WeatherFileDays).