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The initial zone temperature is the results of 1) all zones being initialized at 23 deg-C, and 2) the results of a warmup period where the first day of the run period is simulated multiple times until convergence. Whatever zone temperature is calculated at the end of warmup convergence is used for the beginning of the simulation. See the Engineering Reference for more information on this.

The only inputs you can change related to the warmup calculations are found in the Building object, specifically the criteria used for convergence and the min/max number of warmup days.

The initial zone temperature is the results result of 1) all zones being initialized at 23 deg-C, and 2) the results of a warmup period where the first day of the run period is simulated multiple times until convergence. Whatever zone temperature is calculated at the end of warmup convergence is used for the beginning of the simulation. See the Engineering Reference for more information on this.

The only inputs you can change related to the warmup calculations are found in the Building object, specifically the criteria used for convergence and the min/max number of warmup days.