Ventilative cooling is the use of natural or mechanical ventilation strategies to cool indoor spaces. It can significantly reduce the cooling energy demand in summer or mid-season conditions. Therefore, ventilative cooling is increasingly common in NZEBs. This BUILD UP Web Seminar addresses: Challenges for ventilative cooling in the context of NZEB - the venticool platform; Potential energy savings and the new IEA EBC Annex 62 on ventilative cooling; and Case studies - demonstrated high level summer comfort in real buildings.