Jean: Thanks for your updates. Let me summarize your wish list: 1 Zone level EMS control 2 Zone ACH modulation with given min and max limits It should be pointed out that both features can not co-exist in the code. When EMS is launched, it takes over everything. Best regards, Lixing From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean Marais Since I can't modulate the openings, I have found a good compromise for big windows is setting the opening factors for all openable windows at 10%. This reduces the ACHs from 40 to 4 or 6 depending on winter or summer conditions. Attached is a somewhat improved model. I'm going to implement this on a big model soon using macros to set up the EMS per zone. If
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