The global dedicated outdoor air systems (DOAS) market was valued at USD 5.31 billion in 2025 and is forecast to reach USD 8.46 billion by 2031, representing an 8.2% compound annual growth rate, according to ResearchAndMarkets.com's report. DOAS equipment separately conditions outdoor air and manages latent loads, easing pressure on primary HVAC systems while supporting ventilation, humidity control and indoor air quality. Demand is being driven by stricter ventilation standards, green-building investment, energy-efficiency targets, smart infrastructure and the modernization of aging HVAC systems. Asia-Pacific leads the market, while the Middle East offers additional opportunities because of its cooling and humidity-control requirements. Packaged systems hold a significant position, systems below 20 tons are the leading capacity segment, new construction is the fastest-growing implementation category, commercial properties are the largest and fastest-growing end-user segment, and cooling is the leading requirement.