Look at the tag on the outdoor unit. Somewhere in the model # will be a 2 digit number that is divisible by 6. Get that #, divide it by 12 and you have your answer. 24= 2 tons, 30= 2.5 tons etc.
3.5 Ton unit.
5 Ton
4
1.5TON.
3.5
3.5 tons
hvac unit
3 ton
3 ton
2.5 Tons
2.5
4 ton