Air Duct Supplies How Much Energy Is Dissipated From The Forced Air Supply Ducts As Opposed To The One Just Heating Them.?

How much energy is dissipated from the forced air supply ducts as opposed to the one just heating them.? - air duct supplies

I do not know what that means "only their heating." In general, if the pipes are well insulated to R-8 or more, is neglecting the heat loss through the wall of the channel. Air tightness is an area much larger loss of efficiency of scattering and radiation.