Everyone should get the air ducts swept out every couple of years or so, depending on what kind of air quality your house naturally has.
Some houses are so well ventilated that the air circulation plan goes for a unquestionably long time before getting dirty.
In homes with a lot of critters or kids, or in homes that have little ventilation and rely on recycled air, the ducts can get dangerously dingy in a matter of weeks. The only way to be sure is to stay vigilant and check out your plan every once in a while. You don’t have to be an expert to take the grate off of your air vent. You can shine a flashlight into the air duct and just take a look. If you can see dust, dirt, dander, or hair on the inside of the air duct, that means it is time to call an expert. I suggestedyou to never try and disinfect the air duct yourself, you actually need to have a professional do it for you. Air ducts are made from sheet metal, which is incredibly durable, however still can get weak and brittle over time. If you have old and weak air duct, your attempts to wash them disinfect might result in broken seals. If the sealant holding the air duct together is compromised, your air quality suffers and the overall performance of your Heating and Air Conditioning plan becomes weaker. If you suppose what you’re doing then by all means disinfect your own air ducts. Otherwise, I feel you should leave it to the Heating and Air Conditioning professionals.