Duwaco Air source heat pump ventilation system is a rooftop air conditioner, with intelligent automatic air exchanging system.  Allow me to explain it in three aspects.

The automatic air ventilating function is controlled by the system based on the CO2 concentration. If the CO2 concentration is over the default value, the system will work for a while to make sure the concentration is under control. The reference parameters can be set by the users.

About the air energy collecting function, the system is always collection air source energy. If the air conditioner is on, the system collects energy from the exhausting air and the inlet air. If the air conditioner is off, the system collects energy in one way

The air ventilation system can change the air and cooling/heating at the same time.