The answer to 'how to maintain air duct cleaning' is to have your air ducts professionally cleaned every 3-5 years, or more frequently if you have pets, smoke indoors, or notice increased dust or allergens in your home. Professional duct cleaning uses specialized equipment to remove built-up dust, debris, and contaminants that can reduce air flow and indoor air quality.
Between professional cleanings, you can maintain your air ducts by regularly replacing your HVAC air filters, using a vacuum with a HEPA filter to remove surface dust, and sealing any visible leaks or gaps in the ductwork. It's also important to address any moisture issues that could lead to mold growth in the ducts.