Long-term ventilation variation in two naturally ventilated Stockholm dwellings

For that study passive tracer gas measurements of ventilation were performed in a single-family house and in a flat in Stockholm during four consecutive winter seasons The correlation between ACH and indoor-outside temperature difference is analysed for each dwelling and does not appear good enough for predictive use .The lack of good correlation between ACH and natural driving forces may be due to a highly variable influence from occupant behaviour.