For all the AC folks, is there any routine or regular service that should be done on the AC unit? The unit is about 20 years old and in the ten years that we've owned the house I've never done anything to the unit other than housing it off periodically. The significant other says I should call someone in for a service but is there anything that actually needs to be done? It still blows cold and isn't loud or anything so I don't really have any concerns.
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