If I can believe the original installer the system was to be a 3.5 ton. But a 3 ton was actually chose because of availability.
I just looked at my the contract/invoice. Mr. installer had told me he figured the system requirements to be 3.5 ton. He wrote the Carrier air handler # FV4BNA00500 w/15KW strip heat on the contract. Seems that is a 4 ton unit, so he rounded up as there is no 3.5 ton offered. He made a big deal about this handler as it was an "A" coil, which he said would help with dehumidification.
But he installed a Carrier FV4BNF003000 AAAA air handler with out telling me. Upon inspection, this has a "slant" coil.
If I am interpreting the numbers correctly. It appears the 003 has to low of CFM for my supply needs. And possibly with the slant, may be less capeable of dealing humidity which was high on my list of priorities (bad asthma).