HSD - 35A Double Duct Portable ACThe HSD 35A Double duct air cooler further enhances cooling performance and versatility. The most significant improvement over single duct air conditioner is the inclusion of two air ducts, resulting in a substantial increase in both air output and cooling capacity, delivering a more powerful cooling experience to users. In addition, various operating modes have been adjusted, including high airflow, low airflow, powerful cooling, and timer modes.