Supply ventilation frameworks include the utilization of a fan to bring outside air into the home while air holes out of the home through openings in the shell, fan pipes and deliberate vents (if any exist). A normal supply ventilation framework brings natural air into generally one or more rooms inside of the home that inhabitants involve frequently (e.g., rooms, front room. 

Vitality recuperation ventilation frameworks give a controlled method for ventilating a home while minimizing vitality misfortune. They decrease the expenses of warming ventilated air in the winter by exchanging warmth and/or stickiness from the warm inside air being depleted to the crisp (yet cool) supply air. In the mid year, within air cools the hotter, approaching supply air to lessen ventilation cooling expenses.

There are two sorts of vitality recuperation frameworks: heat-recuperation ventilators (HRV) and vitality recuperation ventilators (ERV). HRV frameworks draw natural air into a home while all the while depleting stale air from the home. Amid this trade, the two airstreams go through a center inside of the unit where a segment of warmth from one air stream is moved into the other (more often than not the indoor air in winter and the outside air in summer).