A heat recovery ventilator (HRV) is a device that improves indoor air quality by exchanging stale indoor air with fresh outdoor air while conserving energy. It works by transferring heat from the outgoing air to the incoming air, which helps maintain a comfortable temperature inside a building. This process reduces the need for additional heating or cooling, making it an energy-efficient solution. HRVs are particularly useful in tightly sealed homes where natural ventilation is limited. They help prevent moisture buildup and reduce indoor pollutants, contributing to a healthier living environment. Many modern HVAC systems incorporate HRVs to enhance overall efficiency and comfort.