Required, but not included: 1/4" x 3/8" line set (x3) | The Gree Multi21+ Tri-Zone LIVO 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+ LIVO Wall Mount Ductless has a compact design, for quiet comfort and attractive appearance. 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. You can count on consistent comfort from Livo+. Proof of licensed installation is required. The receipt/invoice from your contractor should be sufficient.