how to ignore data from design days in Python EMS simulation?

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It is currently set to NO (everything else is Yes). Is this affecting my system sizing at all? I would like everything to be automatically appropriately sized by the sim.

What "calling point" are you using? Like on_begin_timestep_before_predictor, on_begin_new_environment, etc.?

@bonnema right now I am just using after_predictor_after_hvac_manages for testing, but soon want to find a good calling point(s) to get the zone 'state' and then actuate within the same time step, based on that 'state' for control purposes

You want the "Do Zone Sizing" field in the SimulationControl object set to 'Yes' if you have Sizing:Zone objects in the model. Same follows for the next two fields ('Yes' system sizing and 'Yes' plant sizing) if you have Sizing:System and Sizing:Plant objects (respectively). Usually if I am getting outputs for sizing days it is because the 'Run for Sizing Periods' field is set to 'Yes'. You stated the 'Do HVAC Sizing Simulation for Sizing Periods' field is set to 'Yes.' Maybe that field is causing the sizing day outputs? That is a new-ish (and optional) field. Try setting that to 'No'.

Setting 'Do HVAC Sizing Simulation for Sizing Periods' to 'No' fixed my problem, the simulation no longer runs for my 2 design days!! Thank you. Do you know if this impacts the autosizing of my HVAC tho? I am new to E+ and not completely familiar with the sizing calculations and autosizing process.