Why Measure Duct Leakage?

Energy Loss

Leaky ducts pose health, safety and comfort problems and account for about 25% of the total energy lost in a typical house. Because it's "by far the most cost-effective way to save energy" (EPA quote), building codes now demand higher performance. 

Although visual duct inspections may be allowed in some states, duct testing provides an easier, faster, verifiable pass or fail test result. In many instances, it has a greater impact on energy use than air leaks anywhere else in the house or building enclosure. The single largest cause of performance problems in small commercial buildings is often duct leakage.

A study completed in Florida examined 46 homes. They found that sealing the duct leakage reduced air conditioner use by an average of 17%. This leads to savings of $110 per year and the repairs were at a one-time cost of $200. 

Repeatedly, studies show that sealing leaky duct systems is one of the most
cost-effective measures that a homeowner can take. Heating or cooling, the same holds true in all climates. Another study in Arkansas noticed an average savings of 22% on heating bills when duct leakage sealing was performed.