HVAC · Scope

Ductwork and HVAC replacement: is the distribution system part of the quote?

Direct answer: replacing heating/cooling equipment does not automatically fix duct leakage, restrictions, poor return paths or distribution problems. A useful proposal makes clear whether the existing duct system is assumed acceptable, being evaluated or being modified.

Residential attic ductwork distribution system and mastic sealed joints

HomeQuoteCheck decision visual for /hvac/ductwork-scope/. Use this structure to verify contractor proposal scope.

What to clarify

Whether duct condition and airflow were reviewed as part of the proposal.
Which supply/return modifications are included.
Whether new transitions, plenums or filter arrangements are included.
Whether sealing/insulation work is included or excluded.
What comfort problem the proposed duct work is intended to address.

Why this changes quote comparisons

Two contractors may quote the same nominal equipment capacity while proposing very different distribution-system work. That is a scope difference, not simply an equipment-price difference.

Normalize the full HVAC scope

FAQ

Do I always need new ducts with a new HVAC system?

No. Existing ductwork may remain, require targeted changes or need broader correction depending on condition and design.

Can this page tell whether my ducts are undersized?

No. That requires measurements and professional airflow/design evaluation.

Related decisions

Cost drivers · Quote Checker · Before You Sign

Design boundary

This page does not diagnose duct leakage, airflow or sizing for a specific home.