An energy-recovery ventilator (ERV) is a type of ventilation system that helps to improve the air quality in a home or commercial building. It works by transferring heat energy from the exhaust air to the incoming fresh air, thereby reducing the amount of energy needed to heat or cool the building. This type of system is becoming increasingly popular as it helps to reduce energy costs while also improving indoor air quality. ERVs can be used in both residential and commercial buildings, and they are often used in conjunction with other HVAC systems such as air conditioners and furnaces. ERVs are designed to reduce the amount of energy needed to heat or cool a building by transferring heat energy from the exhaust air to the incoming fresh air. This helps to reduce the amount of energy needed to heat or cool the building, resulting in lower energy bills. Additionally, ERVs can help to improve indoor air quality by removing pollutants from the air, such as dust, pollen, and other allergens. ERVs are becoming increasingly popular due to their energy-saving capabilities and improved indoor air quality.