What is controlled mechanical ventilation with heat recovery?

Ventilation with heat recovery is a ventilation system where the quality of the air is efficiently guaranteed, given that when we ventilate these systems use a heat recovery unit to avoid energy loss. By filtering and acclimatizing the air that enters from the outside, it is possible to achieve a high degree of thermal comfort as well as clean and renewed air, expelling to the outside the harmful particles present in the stale air.