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These ERV/HRV configurations are NOT recommended because outdoor air can be sucked back into the ERV/HRV before being distributed to the living space

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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

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If integrating an ERV/HRV with the heating/cooling duct system, add dedicated ducts for either the supply or return side to prevent short-circuiting of air distribution

If integrating an ERV/HRV with the heating/cooling duct system, add dedicated ducts for either the supply or return side to prevent short-circuiting of air distribution

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Karuna Passive House Ventilation System

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Video discussing the heat recovery ventilation (HRV) system in a passive house.

Whole House Ventilation Strategies for Existing Homes

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Guide describing how to select and install whole-house ventilation systems for existing homes.