An Energy Recovery Ventilator (ERV) is a mechanical device designed to improve indoor air quality while conserving energy. It works by exchanging stale indoor air with fresh outdoor air, transferring heat and moisture between the two airstreams. This process helps maintain comfortable humidity levels and reduces the energy needed for heating or cooling. ERVs are particularly beneficial in tightly sealed buildings, where natural ventilation is limited. By using an ERV, homeowners can enjoy better air quality without significantly increasing energy costs. This technology is often used in conjunction with heating and cooling systems to enhance overall efficiency and comfort.