Clivet Essential 2 dual split air conditioner 18000+24000 BTU inverter class A external unit 12.5 kWClivet Essential 2 dual split air conditioner 18000+24000 BTU inverter class A external unit 12. 5 kW The air conditioner kit is equipped with the following indoor units: 1 x 18000 BTU Ideal for rooms from 50 to 60 sqm with an average height of 2. 7 m 1 x 24000 BTU Ideal for rooms from 80 to 100 sqm with an average height of 2. 7 m THE INTERNAL UNIT 18,000 BTU Ideal for rooms between 50 and 60 m2 with an average height of 2. 7 m The Essential 2 wall