How Is a Fresh-Air System Different from an Air Conditioner with Fresh-Air Intake?

The way the equipment is used also matters. People need fresh air at all times, so a fresh-air system is intended to operate continuously, 24 hours a day and 365 days a year. An air conditioner is not designed for this purpose. It primarily responds to indoor temperature instead of providing uninterrupted ventilation.

In addition, the fresh-air function built into an air conditioner usually offers only low-volume ventilation and basic filtration; it does not provide the heat-exchange function of a dedicated fresh-air system. During operation, a heat-exchange module transfers heat and moisture between indoor exhaust air and outdoor supply air, reducing the cooling or heating energy lost through ventilation. By contrast, a fresh-air air conditioner continuously pushes already conditioned indoor air outside. The unit must then compensate for the resulting temperature loss, which can substantially increase electricity consumption.