Sustainable Energy Authority of Ireland (SEAI) together with the Air Infiltration and Ventilation Centre (AIVC) organised a symposium entitled “ Quality ventilation is the key to achieving low energy healthy buildings ” held on 27-28 March 2019 in Dublin, Ireland.  The 2 day workshop provided a wealth of insights from experiences both nationally and internationally. It informed approach on ventilation as a key component of delivering both new buildings and deep retrofit low energy buildings.