Inspect the whole duct system, including the attic, crawlspace, garage and basement as needed
Evaluate the system's supply and return air balance. Many systems have 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 with duct insulation that carries an R-value of 6 or higher
Include a new filter as part of any duct system improvement
Evaluate air flow after repairs are completed
Ensure there is no backdrafting of gas or oil-burning appliances, and conduct a combustion safety test
after ducts are sealed.

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