The MRCOOL DIY 3 Zone is a ductless multi-zone mini split air conditioning system designed for use in three separate zones or rooms. It is a DIY (Do-It-Yourself) system, which means that it is designed to be easy to install and set up without the need for professional help. The system comes with everything needed for installation, including pre-charged linesets, quick connect fittings, communication wires, and can be installed using basic hand tools. The MRCOOL DIY 4th Gen 3 Zone is designed to be energy-efficient at 21-23 SEER, with an Inverter-driven compressor that adjusts the cooling output based on the temperature needs of each zone. It also features Wi-Fi connectivity, allowing users to control and monitor the system remotely through a smartphone app.