I have found that A/C systems are entirely dirty as well as gross, but first an air conditioner equipment sucks up dirt, dust as well as hair to store it in the air duct.
You need to get air duct cleaning every 5-7 years, but look up pictures sometimes of outdated air duct. It will make your skin crawl how gross it looks. The air filter also catches debris from getting into your system. It can only do so much. The inner workings still need a wonderful scrubbing from time to time. There is more than just dust that is a concern as well. The cooling coil in the idea also is a wet site. Where there is wet, mold forms. A lot of people don’t even realize they are blowing air over the mold spores inside their system. It is smart to at least once a year have the equipment learn to avoid mold as well as mildew growth inside of it. Another part is the condensate drain. So much water is flowing here typically. It is simple for algae to back up as well as clog the drain. Have you ever seen an air conditioner equipment leaking down the sides, spit out water or be in a puddle of water? This is all due to a condensate drain that is clogged with algae. It is an simple fix, just muck it out. It is entirely gross but it makes a world of difference. None of the A/C cleaning tasks are hard, just icky. If you are willing to get your hands dirty you only need to call an air conditioner supplier for service once a year.