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Tag narrows humidification rules after debate on health, energy; agrees 50% cap in hotter climates
Summary
The TAG approved rewritten humidification and dehumidification language that simplifies duplicate sections, keeps adiabatic humidification as the primary option, and sets different maximum relative‑humidity caps by climate zone (30% in drier zone 4c, 50% in warmer zone 5b) after debate over health impacts and energy use.
The Washington State Building Code Council’s Commercial Energy Code TAG approved changes to the 2024 energy code sections addressing building humidification and dehumidification, adopting a rewrite that combines system‑ and control‑requirements into one section and sets humidity caps targeted by climate zone.
The TAG voted 10‑5 with one abstention to approve the revised proposal after a long discussion that focused on the energy penalty and health impacts of higher indoor relative humidity. Proponents said…
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