It is a 2 1/2 ton. There are 12,000 BTU per ton of cooling. The 30 in the model tells you the tonnage. which is 30,000 BTU.
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3
3.5
3and a half
2 and a half
2.5 ton
2 ton
It is a 3 ton unit.
2.5 tons
The 36 designates tonnage when divided by 12, in this case, 3-ton
2 ton (24000btu)