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Your description is too ambiguous. You should show more details...This is a simple answer, and may be not correct. As you said above, the natural ventilation setpoint is 19C, and heating setpoint of ideal loads air system are 18C. So, the when outdoor temperature is lower than 19C, the openings of natural ventilation will open, and the natural ventilation of course could make your indoor temperature lower than 18C. For example, it will bring 15C outdoor fresh air into room. And so, the ideal loads air system will start to warm the indoor air and generate the heating load and higher heating rates. If you just want to know the cooling load, you should not set the heating setpoint in the HVAC: templates.