In a fresh air only system, the air conditioning compressor and evaporator are used to cool the outside air, which is then ducted directly into the passenger compartment of the car. This type of system does not have a recirculation mode, so the air in the car is constantly replaced with fresh air from outside.
Fresh air only systems are often used in vehicles that are used in dusty or polluted environments, as they help to keep the air inside the car clean and free of contaminants. They can also be beneficial for people who suffer from allergies or asthma, as they reduce exposure to allergens and pollutants.
However, fresh air only systems can also be less efficient than recirculating air systems, as they require the air conditioning compressor to work harder to cool the outside air. This can result in increased fuel consumption and reduced cooling performance.
As a result, most modern cars use a combination of fresh air and recirculated air to provide the best balance of comfort and efficiency.
