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Condenser and coil sizing for HVAC unit
Installing a HVAC system (Unico) , Calcs say I need 24,000BTUh for the house and 5500BTUh for latent cooling. For a total of 29,500BTUh. I live in Mpls where humidity removal is a priority.
Mfgr has two air handler sizes (2.5T & 3.5T) and allows the condenser to be sized +-0.5 ton for each (Ex: you can run the 2.5T unit with a 2T, 2.5T, or 3T condenser).
So I can go 3T Condenser and 2.5 T coil for 29,000BTUh or
3T Condenser and 3T coil for 31,000Btuh
The airflow for either unit can be adjusted to match the BTU and the required outlet CFM. But the larger unit has about 2X the fan size and hence 2X the amps.
I favor the smaller size becuase I've heard its better to undersize these systems. Plus I found a deal on a 2.5T airhandler (saves $600).
Looking for advise on performance and operating costs for the options.