The MRCOOL O-09-HP-WMAH-230C-O Olympus 4th Gen 9K BTU 3/4 Ton Ductless Mini-Split Wall Mounted Air Handler is an indoor unit designed for compatible MRCOOL Olympus ductless mini-split heat pump and air conditioning systems. It works by circulating conditioned air delivered from the outdoor condenser, providing efficient heating and cooling with consistent airflow and quiet operation. https://www.partshnc.com/mrcool-olympus-4th-gen-air-handler-o-09-hp-wmah-230c-o