Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Many heating ducts are metal, so they conduct noise quite readily from the air-handling unit to your rooms.
To break the conduction of sound, you can have a heating contractor insert flexible insulation ductwork between the furnace or air conditioner and the ductwork runs.
If you hear a pinging or popping sound coming from the ductwork, this may be caused by thermal expansion or by air blowing past a loose flap of metal.
Track along the duct runs, listening for the sound. If you locate it, make a small dent in the sheet metal to provide a more rigid surface that's less likely to move as it heats and cools.
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