How long does duct leak testing take?

A standard test runs about 30 to 60 minutes. We temporarily seal all registers, connect the duct blaster to a main supply or return opening, and run the measurement. Results are available on the spot.

How much does duct leak testing cost?

As a standalone service, expect $200 to $400. It is frequently bundled into a comprehensive duct evaluation or an energy audit at a reduced incremental cost.

What's considered an acceptable duct leakage rate?

Current energy codes call for less than 4 percent leakage on new ductwork. In existing homes, anything below 10 percent is considered good. Many older WNC homes test at 20 to 30 percent or worse, meaning a substantial share of conditioned air never makes it to the living space.

Duct Leak Testing — Find & Fix Hidden Air Leaks

Duct leak testing quantifies exactly how much conditioned air escapes your ducts — and pinpoints where it goes.

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Professional Duct Leak Testing — Find & Fix Hidden Air Leaks in Asheville & Western NC

Hard Numbers Instead of Guesswork

Duct leak testing uses calibrated instruments to measure your duct system's actual leakage rate. A duct blaster — a specialized fan paired with a precision pressure gauge — pressurizes the ductwork and records how much air escapes. The result is expressed in CFM (cubic feet per minute) of leakage at a standardized test pressure, giving you a clear, objective figure rather than a rough guess about how much energy your ducts waste.

Situations Where Testing Pays Off

Duct leak testing adds value whenever you suspect leaky ducts are behind comfort issues or inflated bills, when you plan duct sealing and want verified before-and-after data, when you are investing in new equipment and want to confirm duct integrity first, or when your home is undergoing an energy efficiency evaluation. Across Western North Carolina, where countless homes run ducts through unconditioned attics and crawl spaces, duct leakage is a leading source of wasted energy.

Interpreting the Results

A tightly sealed duct system leaks less than 4 percent of total airflow. Many existing WNC homes register leakage rates of 15 to 30 percent or higher — particularly those with aging flex duct or original ductwork dating to the 1970s through 1990s. Following the test, we deliver a detailed report with your measured leakage rate and targeted recommendations, whether that means sealing, duct repair, or partial replacement.