Heat Recovery Ventilators and Energy Recovery Ventilators are requirement in tight construction homes.
HRVs simply exchange heat from exhaust to ventilation (incoming) air.
ERVs exchange heat and pass moisture from exhaust air to incoming air in the winter and help dry the incoming air during the cooling season.
A must in any tight construction home.
https://www.venmar.ca/21-detail-advice-hrv-and-erv-why-choose-a-hrv-heat-recovery-ventilator-.html