Should I replace or clean my flex duct?

Whether to replace or clean flex duct depends on its age, condition, and contamination level. In most cases, flex duct should be replaced rather than cleaned, especially if it's over 15 years old or showing signs of damage.

Flex duct cleaning has significant limitations compared to rigid metal ductwork. The ribbed interior surface of flex duct traps debris more effectively, making thorough cleaning difficult. Professional duct cleaning equipment can damage the inner liner of flex duct, and the flexible material can harbor mold and bacteria in ways that resist cleaning. If your flex duct is sagging, has visible tears, or feels soft when squeezed, replacement is the only effective solution.

Replace flex duct if you notice: sagging sections that create air flow restrictions, visible damage like tears or separated joints, excessive dust buildup that cleaning hasn't resolved, musty odors coming from vents, or if the ductwork is original to a home built before 2010. Modern flex duct has better insulation values and improved inner linings that resist contamination.

In Ottawa's climate, proper ductwork is crucial for energy efficiency during our cold winters and humid summers. Damaged or contaminated flex duct can reduce your HVAC system's efficiency by 20-30% and contribute to poor indoor air quality. The typical cost for flex duct replacement in Ottawa ranges from $8-15 per linear foot, while whole-home duct cleaning costs $400-800.

For safety and code compliance, have a licensed HVAC technician assess your ductwork. They can determine whether cleaning might be effective or if replacement is necessary, and ensure any new installation meets current building codes. If you're experiencing poor air flow, excessive dust, or high energy bills, it's worth having your ductwork professionally evaluated.