This General Air Conditioner 1.5 Ton ASGA-18FMTB is a Rotary Compressor Air conditioner. Rotary Compressor is smaller than Admiral Compressor. Rotary is the energy saver. Condenser unit is made by 100% Copper; therefore there is no risk for out of Gas (Refrigerant). You may think that it is same as ASGA18FMTA, but it has several dissimilar from ASGA18FMTA.