The MRCOOL Olympus Duct 18,000 BTU is a hidden air handler for large rooms. It is part of our Slim Duct Multi-Zone collection. Because it is hidden, it is ideal for maintaining the aesthetic of your home. It can be paired with other units in a Multi-Zone setup. This unit provides quiet and efficient cooling and heating. It is an excellent choice for large bedrooms or living areas where you want a clean look.