How often should air ducts be cleaned in Oregon homes?

Air ducts should be professionally cleaned every 3-5 years under normal conditions, according to NADCA industry standards. However, Oregon’s unique climate creates conditions warranting more frequent cleaning. The Oregon Department of Environmental Quality documents recurring wildfire smoke events affecting communities from Portland to Eugene, and Oregon’s extended wet season (October-May) creates ideal conditions for mold growth in HVAC systems. Oregon homes should consider cleaning every 2-3 years, or immediately following significant wildfire smoke exposure, after home renovations generating construction dust, if occupants suffer allergies or asthma, with pets shedding dander, or when visible mold appears near vents.