The HWAC-1217S unit uses a 17 SEER 12,000 BTU 4-in-1 system that delivers cool air for the warm months, heat for the cold months, dehumidification to remove moisture, and a fan to circulate air year-round. This unit has multiple user-friendly modes that help provide a controlled environment. This unit is designed to function in a 300-500 sq. ft. space.