the pdf of the researcher's paper: https://www.cell.com/action/showPdf?pii=S2589-0042%2823%2902842-0 https://www.cell.com/action/showPdf?pii=S2589-0042%2823%290

the pdf of the researcher's paper: https://www.cell.com/action/showPdf?pii=S2589-0042%2823%2902842-0 https://www.cell.com/action/showPdf?pii=S2589-0042%2823%2902... Essentially, carefully managing the path that air takes into the building and out allows for heat to be recovered (like a counter-current heat exchanger, or radiator). This is similar to how heat boxes for efficient chimneys work - make the path for hot air to escape necessarily impart the heat into the surrounding brickwork. TFA: > Further analysis shows significant heating savings are possible in mildly cold seasons compared to natural displacement (74%) and natural mixing (60%) ventilation. The 'ducting' for the airflow was hollow cavities in the various masonry walls in the building, forming a circuitous route long enough to recover the heat while maintaining good airflow for ventilation.