The answer to 'how often to replace duct cleaning' is that most experts recommend having your air ducts professionally cleaned every 3-5 years. Regular duct cleaning helps remove built-up dust, debris, and allergens that can circulate through your home's HVAC system. This improves indoor air quality and the efficiency of your heating and cooling equipment.
The frequency of duct cleaning can vary depending on factors like the size of your home, whether you have pets, and how often the HVAC system is used. Homes with higher occupancy, more dust or allergens, or frequent HVAC use may need duct cleaning more often, such as every 2-3 years. It's best to have a professional HVAC technician assess your system and provide a recommendation for your specific situation.