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Quality crawl space ductwork lasts between 15 and 20 years, though this varies based on environmental conditions and maintenance practices. Metal ducting offers greater longevity than flexible options, particularly in moisture-prone areas. 

Regular professional inspections can identify minor issues before they escalate to major problems. When your system reaches the 15 to 20-year mark, having a professional evaluation can help determine whether repair or replacement represents the more economical long-term solution.

Standard homeowners' insurance policies often exclude coverage for ductwork replacement due to age-related deterioration or normal wear. However, if your ductwork sustains damage from covered perils such as fire or certain water events, your policy might provide compensation. Review your specific policy language or consult with your insurance representative to understand your coverage limitations. Some insurers offer supplemental coverage options for home systems that might provide additional protection for your HVAC components.

Watch for multiple disconnected sections, widespread corrosion, collapsed ducts, or extensive mold contamination. Other indicators include dramatically increased energy bills, rooms that never reach comfortable temperatures, or persistent musty odors throughout your home. Systems approaching 20 years of service that require frequent repairs often make better candidates for replacement than continued maintenance.

 A professional inspection with specialized equipment can definitively assess your ductwork's condition.

Selective reuse of existing ductwork components depends entirely on their condition and compatibility with your new system. Sections without damage, corrosion, or contamination might remain serviceable when properly cleaned and sealed. However, mixing old and new components can sometimes create efficiency issues or accelerate the deterioration of the entire system. 

Consult with your HVAC professional for an objective assessment of which components, if any, remain suitable for continued use.

While not mandatory for every situation, crawl space encapsulation provides significant protection for your new ductwork investment in moisture-prone environments. This process, costing between $5,000 and $15,000, creates a moisture barrier that helps protect both your ductwork and your home's structural elements. 

The decision depends largely on your specific crawl space conditions and local climate factors. A professional evaluation can determine whether encapsulation would provide meaningful benefits for your particular circumstances.