ArticleJournal of the Royal Society of New Zealand2025
What is drier? Understanding humidity in green-certified dwellings: a winter case study from Auckland, New Zealand.
Article in Journal of the Royal Society of New Zealand, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Despite the growing emphasis on green-certified buildings, there remains a notable gap in understanding their humidity performance, particularly in residential settings. This study addresses this gap by evaluating the wintertime humidity performance of 40 subsidised, 7-Homestar certified apartments for older residents in Auckland, New Zealand. While current building science guidelines recommend an optimal relative humidity (RH) range of 40% to 60%, our results show frequent exceedances of this range. However, when assessed using absolute humidity (AH), the apartments consistently fell within the epidemiologically acceptable range of 8-14 g/kg. This discrepancy highlights the need to reconsider which humidity metric-RH or AH-better reflects acceptable indoor environmental quality for health and comfort. Resident feedback indicated satisfaction with indoor humidity levels, despite elevated RH. This study calls for a reassessment of humidity guidelines in green-certified buildings to better balance occupant health, comfort, and energy efficiency.
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