Why air conditioning can not replace the new air system?

The new air system is to manage indoor and outdoor air exchange, air conditioning is to manage indoor cooling and heating, the two have no conflict. The new air function of the air conditioner does not enable the exchange of indoor air with outdoor air, and even if it does, it only sends but does not discharge, without reasonable airflow organization, dirty air will always accumulate indoors. Fresh air system combined with air purification equipment, generally in the new air equipment to the outdoor air into the room at the same time, first through the air purification system, the PM2.5 and other airborne particles and bacteria, viruses are filtered clean, and then the fresh air to each room.