An Energy Recovery Ventilator (ERV) is a system designed to improve indoor air quality while maintaining energy efficiency. It works by transferring heat and moisture between incoming and outgoing air streams, allowing fresh outdoor air to enter while exhausting stale indoor air. In cold weather, it pre-heats the incoming air, and in warm weather, it cools it. This process helps regulate humidity and reduces the energy required to heat or cool the air, making ERVs an effective solution for homes seeking better ventilation without sacrificing energy efficiency.