Thermocore T4C18S-H236-Cassette Ductless Mini Split Ceiling Cassette - 36000 BTU Inverter Cooling Capacity along with a 36,000 BTU Heat Pump, this 3 TON Energy Star Ductless Split can cool or heat an area up to 1500 ft². Advanced INVERTER DC Technology provides both energy efficient operation and low ambient operation start-ups. Additional features include auto-diagnostic functions and sleep mode / 24 hour timer. Comes pre-charged with eco-friendly R410A.