The answer to 'how to maintain duct cleaning' is regular duct cleaning is important for maintaining good indoor air quality and the efficiency of your HVAC system. Duct cleaning should be done every 3-5 years, or more often if you have pets, smoke indoors, or notice excessive dust buildup.
Proper duct cleaning involves using specialized tools and equipment to remove dust, debris, and other contaminants from the air ducts, vents, and HVAC components. This can be done by a professional HVAC technician, who has the necessary expertise and equipment to ensure a thorough and effective cleaning.