How often should I have my Cooling or Heating duct cleaned?

Your ducted cooling & heating ducts including return vent should be cleaned every year. Must get duct sanitizing and deodorizing done and if air flow is bad then get your duct work checked
Within few year dust mites and bacteria starting depositing inside your duct and cause bad smell, sometime dead rodent such as mouse got stuck in your duct and your duct air got bad smell, so we will highly recommended to clean or repair your duct every year or so

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