Work with a Professional Contractor for Duct Improvement Projects

Many homeowners choose to work with a professional contractor for duct improvement projects. Most heating and cooling equipment contractors also repair ductwork. Look for a contractor that will:

• Inspect the whole duct system, including attic and crawlspaces.
• Evaluate the system's supply and return air balance. Many systems have air return ducts that are too small.
• Repair damaged and disconnected ducts and straighten out flexible ducts that are tangled or crushed.
• Seal all leaks and connections with mastic, metal tape, or an aerosol-based sealant.
• Seal all registers and grills tightly to the ducts.
• Insulate ducts in unconditioned areas (like attics, crawlspaces, and garages) with duct insulation that carries an R-value of 6 or higher.
• Include a new filter as part of any duct system improvement. The contractor should evaluate air flow after repairs are completed.
• Ensure there is no back drafting of gas or oil-burning appliances, and conduct a combustion safety test after ducts are sealed.

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Energy Star - U.S. Environmental Protection Agency - U.S. Department of Energy