A heat recovery ventilator (HRV) saves energy by transferring heat between the stale air exhausted to the outside and the fresh air that is brought inside. By doing so, the HRV prevents the need to use as much energy to heat or cool the home.The heat is retained inside the house in the winter or outside the house in the summer thanks to this. The Energy Recovery Ventilator (ERV) saves energy by transferring heat as well as moisture. Both HRVs and ERVs are Whole-House Ventilation Systems that allow you to save energy by providing ventilation while also allowing you to use less