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High Mass Cooling with Night Ventilation is good for hot, dry summers. During the day the building is thermally closed to prevent any heat gain. In the evening, the building is flushed with with cold, exterior air. The less cold air available, the more mass is needed. For example, cities with both warm days and evenings will require more mass.

Quick ventilation is also needed to reduce the number of building flushing hours.

This strategy is good when coupled with passive solar gain strategies (direct gain), thermally massive buildings and large and high buildings.