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"Passive" design often looks to achieve the kind of positive heat balance you describe, and you could easily envisage a family house in Graz overheating in summer under some circumstances. 1ach suggests you may be simply scheduling ventilation, but if analysing overheating you should use calculated natvent (airflow network). The beauty of simulation is the ability to test different options, so you should consider different glazing distributions, properties, shading, thermal mass and issues such as schedules and internal gains that affect the overall heat balance. See the free DesignBuilder tutorials if you're new to the software.