Automatic or user-controllable fraction of outdoor air intake is an important feature; ideally homes can modulate between minimal outdoor air (relying on filtration) and maximum outdoor air (on favorable weather days for economizer benefit).
normativepending
Speaker
HostEvidence Quote
“the other piece on this is what is the fraction of outdoor air that's coming into the space and so I think ideally there would be either automatic control of that or a user control of that”
Source
Home Ventilation Advice from HVAC Researcher Jeffrey Siegel: How Many CFM is Ideal?— Home PerformanceCreated: 8/13/2026, 4:55:15 AM
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