A 2,000 sq ft house does not have a standard amount of ductwork. Floor plan, number of stories, equipment location, return layout, branch count and access can all change the quantity and labor. Start with the actual duct system, not a house-size multiplier.
Map the system before pricing replacement
Ask the contractor to identify the main trunk, branches, returns, boots, registers and equipment transitions. A simple sketch or marked floor plan is more useful than a generic “whole-house duct replacement” line.
What drives the job
| Factor | Why it changes scope |
|---|---|
| Access | Open basements and attics are different from tight crawlspaces and finished ceilings. |
| Material | Sheet metal, flex duct and lined systems have different fabrication and insulation needs. |
| Returns | Adding or resizing return paths can require framing and finish work. |
| Insulation | Ducts outside conditioned space may need a specified insulation level. |
| Air sealing | Connections, boots and plenums should be sealed as part of the system. |
| Balancing | Room airflow should be checked after major changes. |
Repair, seal, resize or replace are different scopes
A disconnected branch may need repair. Leaky but otherwise sound ducts may benefit from sealing. Poorly sized trunks or returns can require redesign. Widespread crushed or deteriorated ductwork may justify replacement. Ask what evidence supports the recommended scope.
Drywall and finish repair can be a separate contractor
If ducts are concealed above ceilings or inside chases, opening and restoring finishes can become a meaningful part of the project. The HVAC proposal should state whether access openings, drywall repair and painting are included or excluded.
Do not bury ductwork inside the equipment number
If the project also includes a heat pump, furnace or AC replacement, separate equipment, ductwork, electrical, controls and permit lines. That makes it much easier to compare two proposals that solve the same comfort problem in different ways.
Questions for a ductwork proposal
- Which sections are being replaced and why?
- What material and insulation are specified?
- How are joints and boots sealed?
- Are return-air changes included?
- Who opens and restores finished walls or ceilings?
- What airflow or static-pressure checks are performed after installation?
Use the HVAC Replacement Cost Calculator for the equipment side of the project and the Contractor Quote Comparison for written bids.