Most of what gets sold as air conditioning maintenance around here is a filter change and a look around. A real visit is a measurement job: capacitor microfarads against rated, amp draw against the data plate, superheat and subcooling against target, temperature split, static pressure. If nobody wrote down a number, nobody actually checked anything. Here is what a proper tune-up covers and what you should have in your hand when the truck leaves.
What a Real AC Tune-Up Includes: The Readings That Matter
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