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Best bet is to get the number off of the indoor coil and furnace. The system that is currently in my house has a 3.5 ton condensing unit but the coil inside is a 5 ton coil. This is by design from the factory.
Most coils, especially cooling only coils are sized within a range.
As the others said make sure everything is within spec and clean. I have climbed in attics to find the small door missing where the filter is changed. Owner said oh is a small opening 1" X 20" looks small. But, would you run it with a 4 X 5 hole cut in the side of your return?
Sorry to ramble. Make sure its clean and charged and check the delta T at the supply and return...
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Kevin
'79 Coupe
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