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Compressor amperage increases as the outside air temperature increases.. it is not a good metric by itself. of the largest copper tube that attaches to the outside unit runs cool or sweating then the system is largely OK.
Those remarks about an inline dehumidifier to protect the coils is hogwash... makes no sense at all. it sounds so far like the company you are working with is good at selling a lot of extra's, needed or not.
38% is in the ideal humidity range, a well functioning AC system provides dehumidification by itself, the only thing need to protect the coils is regular air filter changes.
Please remember to rate my service before you leave today. It is how I earn a living, and does not increase your charges.
If you need anything else, just let me know. You can continue asking follow-up questions at no additional cost.
You are welcome Shaun,
Please rate my service, lacking that I loose money, the company only pays me part of your deposit if you rate positively. That does not affect your charges, but is how I earn a living.