HVAC Ductwork Replacement Cost in 2026
HVAC ductwork replacement cost guide for 2026. Estimate duct replacement, sealing, insulation, attic runs, crawlspace runs, and when new ducts are worth it.
How Much Does HVAC Ductwork Replacement Cost?
HVAC ductwork replacement usually costs $3,000-$8,000 for a typical home, with many projects falling around $10-$25 per linear foot installed. Complex attic, crawlspace, or multi-story runs can cost more.
If you are replacing the system too, use the HVAC Replacement Cost Calculator to include ductwork condition in the total project estimate.
Ductwork Cost by Project Scope
| Project Scope | Typical Cost |
|---|---|
| Duct sealing only | $500-$2,000 |
| Partial duct replacement | $1,500-$4,000 |
| Full duct replacement | $3,000-$8,000 |
| Complex full-home replacement | $8,000-$15,000+ |
| Add return ducts | $500-$2,500+ |
When New Ductwork Is Worth It
New or repaired ductwork may be worth it if you have:
- Hot and cold rooms
- High energy bills
- Weak airflow
- Crushed or disconnected flex duct
- Leaky attic ducts
- Mold or pest damage
- An oversized or undersized old system
Duct Sealing vs Replacement
| Option | Best For | Cost |
|---|---|---|
| Duct sealing | Minor leaks, decent ducts | $500-$2,000 |
| Duct insulation | Hot attics or cold crawlspaces | $1,000-$3,000 |
| Partial replacement | Damaged runs only | $1,500-$4,000 |
| Full replacement | Poor layout or old ducts | $3,000-$8,000+ |
Related Guides
- Heat Pump Replacement Cost
- New HVAC System Cost for a 2,000 Sq Ft House
- Mini Split Cost by Room Size
- Energy Efficient Windows Cost vs Savings
FAQ
Should I replace ductwork when replacing HVAC?
Only if ducts are leaky, undersized, contaminated, damaged, or poorly designed. Good ductwork can often be sealed and reused.
How long does ductwork last?
Well-installed metal ducts can last decades. Flex duct often has a shorter useful life and is more prone to crushing, tearing, and poor airflow.
Can bad ducts damage a new HVAC system?
Yes. Poor duct design can reduce airflow, cause comfort problems, and make equipment work harder than intended.