Originally Posted By: Robert L Dean
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Most air conditioning manufacturers make it possible to identify what the tonnage is with the model number of the unit alone.Some use the indoor and some use the outdoor unit.The way to tell is simple.The tonnage goes in increments of 6. For instance ESQ-018.The 018 is a 1 1/2 ton. This is the lowest tonnage. Next is ESQ-024. The 024 is a 2 ton. Next is ESQ-030.
The 030 is 2 1/2 ton.Next is ESQ-036. the 036 is a 3 ton.Next is ESQ-042.The 042 is a 3 1/2 ton. Next is 048 for a 4 ton. Then there is no such thing as a 4 1/2 ton. And finally 060 for a 5 ton. A 5 ton is the largest of the residential units.
This is the most common for residential air conditioning. Some manufacturers do not use this system.Like Rheem for instance.You must have the literature for these. The ESQ I used above is not an actual model number, but just an example.