HRV/ERV (heat/energy recovery ventilator)

An HRV brings fresh air into an otherwise airtight house to prevent the buildup of moisture, bacteria and mould. The outgoing air is used to warm the fresh air before it is circulated throughout the house. An ERV does the same things as well as extracting humidity from indoor air and recirculating it during dry winter months and exhausting it outside during the humid summer.
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