Can heating ducts be changed to something less intrusive? My ductwork was install to work with an old gravity-heater. I now have a new heater with an electric blower system.
I want heating ducts that are less intrusive in the room.

I think this question should be asked in HVAC Forum, not plumbing.

Are your ducts exposed, hanging below the ceiling ? What material are they now ? Is it a livable space ?