I agree that you should avoid installing oversized AC unit. However, if you purchase a house with an AC that is too large and does not control humidity adequately without overcooling, you can add a free standing dehumidifier to reduce the relative humidity in the home rather than replacing your AC if it is otherwise working fine.
A free standing dehumidifier reduces the relative humidity in the home two ways:
1. It reduces the amount of water in the home atmosphere by condensing water out on the dehumidifier cooling condenser coils. This reduces the absolute humidity level in the house atmosphere.
2. The dehumidifier produces heat from the refrigeration effect. The produced heat is rejected to the home atmosphere and thereby raises the temperature of the home atmosphere. Relative humidity is reduced when the home atmosphere temperature is raised and reduces the need for overcooling which causes the meat locker feeling.
These combination of these effects should have your AC-dehumidifier combo producing good relative humidity (less than 60%) without having to overcool your home atmosphere by 3 to 5 degrees F. I have used a free standing dehumidifier to control home relative humidity during heavy rainy periods and also as a backup when we were snowbirds. You can get dehumidifiers with pumps to avoid having to manually drain the pans.
These used to cost about $200 but today are probably $400. However this is a lot less than a new AC unit.
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