The answer to 'difference between duct cleaning and' is that duct cleaning and HVAC system maintenance are two distinct services that serve different purposes. Duct cleaning involves the removal of built-up dust, debris, and contaminants from the ductwork in your home, while HVAC system maintenance focuses on inspecting, cleaning, and servicing the various components of your heating and cooling system.
Duct cleaning is typically recommended every 3-5 years, or if you notice visible dust or debris in the vents, to improve indoor air quality and the efficiency of your HVAC system. HVAC system maintenance, on the other hand, should be performed annually by a professional technician to ensure your system is operating safely and efficiently, and to catch any potential issues before they become major problems.