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The 20 degree split is only applicable if the unit is large enough to cool the space. If it's undersized, you will never see the split, even if it is correctly charged. An amp measurment on the compressor will tell if it's charged correctly. If it is, and you don't get the split, then it's undersized. The good thing about the amp check is that it's valid even if you are leaking air due to a duct problem.
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