The MRCOOL CASSETTE18HP-230C-P-O Olympus 18K BTU 1.5 Ton Ductless Mini-Split Ceiling Cassette with Panel is an indoor HVAC air handler designed for efficient heating and cooling in residential and light commercial spaces. It works by circulating conditioned air through a ceiling-mounted cassette while exchanging heat with the outdoor heat pump condenser through refrigerant lines. Comp... https://www.partshnc.com/mrcool-olympus-cassette-mini-split-ceiling-cassette-cassette18hp-230c-p-o