A Dedicated Outdoor Air System (DOAS) is a specialized HVAC system designed primarily to handle fresh outdoor air, separate from the building’s primary heating or cooling system. Unlike traditional HVAC systems that mix outdoor air with return air from the building, a DOAS exclusively treats outdoor air. This approach ensures that the indoor environment receives a consistent and controlled supply of fresh air, improving indoor air quality. By decoupling the ventilation from the temperature control, a DOAS can operate more efficiently, as it can be optimized for its specific task. This separation also allows for more precise control over humidity levels, further enhancing comfort and reducing the potential for mold growth or other moisture-related issues.