Here's a procedure from Airxcel (Coleman-Mach) for evaluating AC performance. Note that the current measurements are for the compressor only, not including fan(s). That means a trip to the roof and removing the shroud if you have ducted units.
file:///C:/Users/Ed/Downloads/Airxcel%20Evaluating%20Air%20Conditio%20-%20Airxcel.pdf
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