more insulation for attic ductwork?
My HVAC ducts in the attic sit on top of the insulation. They are 1 year old, flexible type. I had an energy audit and the auditor said I did not need deeper insulation. He was 'impressed' with the new system which he said had been well-installed. However I do notice warm (in summer) or cold (in winter) air blowing out of the vents when the system initially turns on, so clearly there is heat loss/gain across the system. Is there something I can lay over the ductwork, like the equivalent of a hot water heater blanket, to help this?