LG Cassette AC: Inverter 1 Way Cassette in 1.0 T, 1.5 T, and 2.0 T - Inverter 4 Way Cassette in 1.5 T, 1.5 T, 2.0 T, 3.0 T, and 4.0 T (High Efficiency). Description: There are two variations of this LG Cassette AC available: LG one-way cassette AC in 1.0 T, 1.5 T, and 2.0 T, and Inverter Cassette 4 Way in 1.5 T, 1.5 T, 2.0 T, 3.0 T, and 4.0 T (high efficiency). LG Cassette Air Conditioners offer superior air quality, solid cooling, comfort, and significant energy savings. Both these versions of LG cassette AC Units have an outdoor unit and an indoor unit.