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4
2.5 ton
looks like a 5 ton unit
Tonnage means the about something weighs or the amount of BTU’s a unit puts out. . The lennox model HS19-311U-2p is a 2.5 ton unit and has a tonnage of 2.5 BTU's.
The 41 indicates 41,000 Btus/hr. There are 12,000 in a ton. You have a 3.5 ton coil, but that number will vary according to how it's matched to the outdoor unit.
2.5 TON TO 3.5 TON
3
Lennox 8 SEER 2.5 Ton AC
There is no such thing as a "cubic ton". There is the ton as a unit of mass (1 ton = 1000 kg), and there is the cubic meter, a unit of volume.
It should be a 4 ton.
4 ton
5 ton