Any loud reoccurring noise in the house can be extremely annoying. Having noisy heating ducts is a common problem that can be fixed by a professional. There may be some labor costs involved, but it does mean a quieter household.
What Causes the Noise
Most heating ducts are made of metal. Metal conducts noise easily from the unit handling the air all the way to your room. If a popping sound comes from the ducts, it may be due to thermal expansion. It can also be causes by a loose piece of metal being caught by the air passing through.