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Tag raises minimum ERV/HRV efficiency and extends requirement into colder climate zone
Summary
The tag approved higher fan-efficiency and sensible recovery thresholds for heat/energy-recovery ventilators and advanced a requirement that ERVs/HRVs be installed in the state's colder climate zone (Climate Zone 5), citing short payback and public-health advantages for tight homes.
The residential energy code tag voted to raise the baseline recognized efficiency for heat- and energy-recovery ventilators (HRVs/ERVs) and to require balanced energy recovery ventilation in the state's colder climate zone.
Specifically, the tag approved proposals that raise the minimum fan efficiency used for equipment recognition to 1.7 cubic feet per minute per watt (CFM/W) and the sensible recovery efficiency (SRE) threshold in the component table from 65% to 67%. Mike Moore, representing the Home Ventilating Institute, told the tag the change is low-cost and rapidly payback: he summarized that bottom-quartile retail pricing for 67%-SRE / 1.7 CFM/W units is only…
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