Energy Recovery Comfort Ventilators are designed to operate in conjunction with your HVAC system to improve indoor air quality. The ventilator sends stale indoor air to the outside through the ventilator’s exhaust system. Meanwhile, fresh air is drawn from the outside and warmed or cooled by the energy present in the exhaust air. Excess wintertime humidity is flushed from the house, as are indoor contaminants. The ERV removes moisture from the incoming humid air during cooling season while simultaneously diluting and flushing out stale, polluted air from the home.