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UNITED STATES · DUCTS & COMFORT

Duct leakage testing: ask for a measurement, not a generic savings claim

By SAVPWR Editorial · Published · 2 min read

For U.S. residential systems. General education, not a site diagnosis or engineering certification.

THE DIRECT ANSWER

What should a duct-leakage proposal tell me?

Ask what test is performed, which leakage it measures, the units and test pressure, and how the result will be verified after repairs. A population-level leakage statistic is not a measurement of your house.

Clarify the quantity being measured

Total duct leakage and leakage to outside the conditioned envelope are different quantities. Test conditions and reporting units matter. Keep the original report rather than reducing it to an unexplained percentage on a sales page. [1][2]

Connect leakage with distribution

A complete assessment should consider damaged runs, supply and return balance, insulation and airflow after repairs. Sealing alone cannot fix every comfort problem. Ask whether access limits prevent inspection and how unresolved sections are documented. [2]

Require before-and-after evidence

Write down the repair scope, target, test method and completion evidence. Where combustion appliances are present, ask how relevant combustion safety is addressed. Do not assume an average leakage figure means an equal percentage reduction in the entire utility bill. [2]

PUT IT TO WORK

Decision exercise

If one bidder quotes a leakage percentage and another quotes CFM at a stated pressure, do not rank them until the quantities and denominator are clear. Ask both to provide the same before/after test format and describe which ducts are outside the conditioned space.

Any numbers in this exercise are illustrative assumptions, not product performance, an installed quote or a personal savings estimate.

What to bring to the conversation

  • Request test type, units, pressure and denominator.
  • Include airflow and return-balance checks.
  • Do not turn average leakage into guaranteed savings.

One more useful distinction

Does a high utility bill prove that ducts leak?

No. Duct performance is one possible contributor; bills alone do not measure duct leakage.

Sources and verification

Technical statements draw on the linked references. Decision exercises and comparison frameworks are SAVPWR’s own explanatory examples. Current rules and program availability should be rechecked before a purchase.

  1. ENERGY STAR — Duct SealingSource checked 2026-11-09 · External primary reference
  2. ENERGY STAR — Professional Duct ImprovementSource checked 2026-11-09 · External primary reference

AI-assisted preparation; checked against public sources. These articles have not received a licensed HVAC professional’s review. Read our editorial policy.

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