Natural vent doesn't show correct result

hi guys
I model a house in HB and using "HB_EP air Flow " I give a schedule and for open the window in a specific hour of the month (for example from 2 AM to 3 AM in July ) and I test for every hour of the year in each season but all result shows that it increases the energy demand in the house.
I wonder if my simulation has a problem or it has a bug in HB although we know using natural ventilation help to reduce energy in some hours!!!

base.3dm (592.0 KB) 5 (798.6 KB)

hi @hamed.sangin. Seeing the image above I will suggest you have to provide a logic having input values for min indoor and outdoor temp variable. Opening area schedule only works above the logic provided. Check this discussion and this.

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thanks a lot
:pray: :pray: :pray: