Aftron Split Air Conditioner 2 Ton, R22, Piston Compressor – AFW240410B/C. A 2-ton air conditioner with a cooling capacity of 24,000 BTUs per hour is suitable for larger rooms or spaces. It uses a piston compressor and uses R22 refrigerant, but is being phased out due to environmental concerns. Energy efficiency is determined by EER or SEER. Professional installation and maintenance are recommended. Compatibility with alternative refrigerants like R410A is crucial.