500-800 Sq Feet a 18000 Btu 1.5 TonMini Ductless Split Air Conditioner may be best for you. 800-1200 Sq Feet a 24000 btu 2 TonMini Ductless Split Air Conditioner would be best for your application. we also have 3 tonMini Ductless Split Air Conditioner, and larger. Answer 2: Now what ...