Duct Replacement Cost in DFW

• $3,000–$5,000: Partial replacement — a few runs, return upgrades, or rebuilding one trunk.
• $5,000–$8,000: Mid-size home, full supply replacement with proper sealing.
• $8,000–$12,000+: Full Manual D redesign, larger homes, two-system layouts, or difficult attic access.

These are real ranges — not bait pricing. Anyone quoting a flat number without measuring static pressure and inspecting the attic is guessing.

• System size: 3-ton vs. 5-ton changes duct sizing across the entire layout.
• Accessibility: Walkable attics are dramatically cheaper than crawl-only or vaulted ceilings.
• Material: R-8 insulated flex, sheet metal trunks, and rigid mains all price differently.
• Design work: A real Manual D redesign costs more than a one-for-one swap — and is often the difference between a comfortable home and a re-do in 3 years.
• Return air work: Most DFW homes have undersized returns; fixing them is part of the real cost.

Modify when: ducts are mostly intact, sized correctly, and the issues are limited to a few leaks, a crushed run, or a single bad room.

Replace when: ducts are widely deteriorated, undersized for the equipment, contaminated beyond cleaning, or the layout itself is wrong.

Most diagnostic-first jobs land in the modification zone. Most "you need new ducts" sales pitches don't.