AC Servicing Vs AC Duct Cleaning: Why You Need Both

The short answer: AC servicing maintains the unit (coils, gas, filter, drainage, and electricals). AC duct cleaning cleans the air pathway (the ducts, grilles and vents that carry cooled air through your home).
Why the confusion? Both involve your AC and mention cleaning, but they solve different problems and are usually handled by different specialists.
Why you need both: Servicing keeps the machine running efficiently. Duct cleaning keeps the air it delivers clean. One does not replace the other.
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