Trane Heat Pump

A Trane split system heat pump, only hvac system installed in a 2100 square foot home. Model # is TWR730A100A1 , manufactured 09/91. I determine this unit to be 2.5 tons, that would be under sized for 2100 square feet. Does anyone have info on this model # to confirm this is a 2.5 ton unit ?
Thanks in advance.

It is a 2½-ton unit, but why do you think it’s undersized for 2,100 square feet?