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That is a 3 1/2 ton unit. one ton of A/C = 12000 btu. The 42 in the model number refers to 42000 btu.
3.5 Ton unit.
It is a Goodman 3.5 ton 13 seer Heat pump.
3.5
4
2 tons
4 Ton
1.5TON.
3.5 tons
4 ton
3 1/2 ton