I hear popping and creaking in my heating ducts,what are some remidies to fix this?thanks:)

Are you sure this is the ducts and not the heat exchanger. It is difficult to describe how to fix. There is a methode called cross-breaking that should have been done when ducts where installed. I sometimes have used a piece of metal used in HVAC work called s-lock to reinforce the portions of duct that pop. Poor filters can cause problems too.