Required, but not included: 1/4" x 3/8" line set (x3) | The Gree Multi21+ Tri-Zone VIREO 24,000 BTU System is powered by Gree s G10 inverter-driven compressor and eco-friendly R410A refrigerant. These units can heat and cool 3 zones without distribution boxes. Our G10 inverter technology saves energy, reduces outdoor noise and keeps room temperature steady by eliminating the harsh starts & stops of conventional systems. The Multi21+ Vireo Wall Mount has a compact design that blends well with any decor. There s even an option to upgrade with a field-installed Wi-Fi kit accessory (sold separately), allowing you to remotely control the unit with your smartphone. Wi-Fi Capable - Kit Sold Separately. The perfect option for your home or office needs. While installation of a ductless split is much easier than a central air system, it's still much more advanced than installing a window unit or portable. Proof of licensed installation is required. The receipt/invoice from your contractor should be sufficient.