Ducts can lose up to 30 percent of airflow through leaks. Find
leaks using the old "smoke trick": For window units, light a stick of
incense and hold it where the unit and the window frame meet; for
central AC, hold the stick near duct connections. If the smoke blows
around, you've got leakage. For ductwork, use foil tape to seal small
gaps and duct mastic for larger ones; for window AC units, stuff foam
between the device and the window frame, taping as needed.
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