"Jim" wrote in message

The hvac supply ducts in my attic are insulated and have a black
cover.
The ducts in the basement have a silver cover. Is this normal? Or
does it matter? I would have thought that the black covered
insulation
in the attic would absorb attic heat and increase the temperature of
the air supply.

Timely question. I wanted to insulate the ducts in my garage. Have
seen the black, but wondered it it's just garbage bags or sheet
plastic stapled over normal attic fiberglass R11 or similar.

Anyone have a suggestion on what to use? Mine are normal galvanized
ducts, some rectangular and some round.

Local Home Depot looks at me funny, when I ask about it.

Rich