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There is a function in E+, ResetNodeData, that is called at the beginning of each new environment. A new environment is a sizing period day, a weather file period, etc. This function resets all node data to a prescribed condition. Tyically 0 for temperature and humidity ratio. The warm up period then converges on a solution, as you describe, for the first day of the simulation. The initial conditions and history of each node in the simulation is then known. The simulation then proceeds normally for the remaining days in that environment.