Instead of leaving the A/C on all the time in our rental, we have a dehumidistat that turns the A/C on only when the humidity exceeds 60%. The A/C is set for 82. We live here, so I check on it regularly in the summer when it's vacant. I have never managed to catch it when it's running, which tells me that the humidity almost never hits 60% indoors. The electric bills agree.
If you leave it on all the time and yours hit 60%, its probably broke, and like others have mentioned, the drain is the most likely culprit.
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