its in the model number 12, 24,18,36,48 is in the model and the number stands for btu 1000 per 2txb120098=12000btu=1 ton
maybe a a million air returns
It is 4 ton.
The tonnage is usually found on the nameplate on the condensing unit outside. 12000 btu= 1 ton 24000=2 ton and so forth.
3413 btu per kW.